C# SelectedItem=null； FilterMode=\u holdFilterMode； } private void AutoCompleteComboBox_下拉列表已打开（对象发送方，RoutedPropertyChangedEventArg

SelectedItem=null； FilterMode=\u holdFilterMode； } private void AutoCompleteComboBox_下拉列表已打开（对象发送方，RoutedPropertyChangedEventArgs e） { var lb=（列表框）GetTemplateChild（“选择器”）； ScrollViewer sv=lb.GetScrollHost（）； 如果（sv！=null） { sv.ScrollToTop（）； } 如果（SelectedItem！=null） { lb.SelectedItem=SelectedItem； _holdSelectedItem=SelectedItem； } } 私有无效下拉切换\单击（对象发送方，路由目标） { IsDropDownOpen=！IsDropDownOpen； 如果（ToggleButtonClick！=null） { ToggleButtonClick（这个，e）； } 如果（IsDropDownOpen） { _holdFilterMode=FilterMode； FilterMode=自动完成FilterMode.None； （（文本框）GetTemplateChild（“文本”））。选择All（）； } 焦点（）； } 私有void AutoCompleteComboBox\u text已更改（对象发送方，路由目标e） { 如果（IsDropDownOpen） { 如果（FilterMode==自动完成FilterMode.None&&FilterMode！=\u holdFilterMode） { FilterMode=\u holdFilterMode； } ScrollViewer sv=（（列表框）GetTemplateChild（“选择器”））.GetScrollHost（）； 如果（sv！=null） { sv.ScrollToTop（）； } } } private void AutoCompleteComboBox_SelectionChanged（对象发送者，SelectionChangedEventArgs e） { 如果（！IsDropDownOpen&&SelectedItem==null） { Text=string.Empty； } } }

---

看得见的
<Grid>
    <mycontrols:ExtendedAutoCompleteBox x:Name="autoCompleteBox" ... />
    <Button HorizontalAlignment="Right" Click="Button_Click">
        <Path Data="F1 M 301.14,-189.041L 311.57,-189.041L 306.355,-182.942L 301.14,-189.041 Z " 
              Fill="Black" Stretch="Uniform"
              Width="8" Height="4"
              />
    </Button>
</Grid>

public class ExtendedAutoCompleteBox : AutoCompleteBox
{
    private ListBox _listBox;

    public override void OnApplyTemplate()
    {
        _listBox = GetTemplateChild("Selector") as ListBox;
    }

    public void ShowAllOptions()
    {
        var selectedItem = SelectedItem;
        Text = "";
        IsDropDownOpen = true;

        _listBox.SelectedItem = selectedItem;
        UpdateLayout();
        _listBox.ScrollIntoView(selectedItem);
    }
}

private void Button_Click(object sender, RoutedEventArgs e)
{
    autoCompleteBox.ShowAllOptions();
}

public class AutoCompleteComboBox : AutoCompleteBox
{
    /// <summary>
    /// Occurs when drop down toggle button is clicked.
    /// </summary>
    public event EventHandler ToggleButtonClick;

    private object _holdSelectedItem;
    private AutoCompleteFilterMode _holdFilterMode;

    /// <summary>
    /// Identifies the DisplayMemberPath dependency property.
    /// </summary>
    public static readonly DependencyProperty DisplayMemberPathProperty = DependencyProperty.Register("DisplayMemberPath", typeof(string), typeof(AutoCompleteComboBox), new PropertyMetadata(string.Empty, DisplayMemberPath_PropertyChanged));
    /// <summary>
    /// Gets or sets the name or path of the property 
    /// that is displayed for each the data item in the control.
    /// </summary>
    public string DisplayMemberPath
    {
        get { return (string)GetValue(DisplayMemberPathProperty); }
        set { SetValue(DisplayMemberPathProperty, value); }
    }
    private static void DisplayMemberPath_PropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var accb = (AutoCompleteComboBox)d;
        accb.ValueMemberPath = e.NewValue.ToString();
    }

    /// <summary>
    /// Identifies the MaxLength dependency property.
    /// </summary>
    public static readonly DependencyProperty MaxLengthProperty = DependencyProperty.Register("MaxLength", typeof(int), typeof(AutoCompleteComboBox), null);
    /// <summary>
    /// Gets or sets the maximum number of characters allowed for user input.
    /// </summary>
    public int MaxLength
    {
        get { return (int)GetValue(MaxLengthProperty); }
        set { SetValue(MaxLengthProperty, value); }
    }

    /// <summary>
    /// Gets or sets a collection used to generate the content of the control.
    /// </summary>
    public new IEnumerable ItemsSource
    {
        get { return GetValue(ItemsSourceProperty) as IEnumerable; }
        set
        {
            SetValue(SelectedItemProperty, null);
            SetValue(ItemsSourceProperty, value);
            Dispatcher.BeginInvoke(() => SetValue(TextProperty, string.Empty));
            _holdSelectedItem = null;
        }
    }

    /// <summary>
    /// Initializes a new instance of the AutoCompleteComboBox control.
    /// </summary>
    public AutoCompleteComboBox()
    {
        StreamResourceInfo sri = Application.GetResourceStream(new Uri("/UI.Controls;component/AutoCompleteComboBox.xaml", UriKind.Relative));
        var sr = new StreamReader(sri.Stream);
        Style = (Style)XamlReader.Load(sr.ReadToEnd());

        DropDownClosed += AutoCompleteComboBox_DropDownClosed;
        DropDownOpened += AutoCompleteComboBox_DropDownOpened;
    }

    /// <summary>
    /// Called when the template's tree is generated.
    /// </summary>
    public override void OnApplyTemplate()
    {
        base.OnApplyTemplate();

        var toggle = (ToggleButton)GetTemplateChild("PopupToggleButton");
        toggle.Click += DropDownToggle_Click;

        var lb = (ListBox)GetTemplateChild("Selector");
        lb.DisplayMemberPath = DisplayMemberPath;
        _holdFilterMode = FilterMode;

        TextChanged += AutoCompleteComboBox_TextChanged;
        SelectionChanged += new SelectionChangedEventHandler(AutoCompleteComboBox_SelectionChanged);
    }

    private void AutoCompleteComboBox_DropDownClosed(object sender, RoutedPropertyChangedEventArgs<bool> e)
    {
        if (SelectedItem == null && _holdSelectedItem != null && SelectedItem != _holdSelectedItem && ItemsSource.Cast<object>().Contains(_holdSelectedItem))
        {
            SelectedItem = _holdSelectedItem;
        }
        _holdSelectedItem = null;
        FilterMode = _holdFilterMode;
    }

    private void AutoCompleteComboBox_DropDownOpened(object sender, RoutedPropertyChangedEventArgs<bool> e)
    {
        var lb = (ListBox)GetTemplateChild("Selector");
        ScrollViewer sv = lb.GetScrollHost();
        if (sv != null)
        {
            sv.ScrollToTop();
        }
        if (SelectedItem != null)
        {
            lb.SelectedItem = SelectedItem;
            _holdSelectedItem = SelectedItem;
        }
    }

    private void DropDownToggle_Click(object sender, RoutedEventArgs e)
    {
        IsDropDownOpen = !IsDropDownOpen;
        if (ToggleButtonClick != null)
        {
            ToggleButtonClick(this, e);
        }
        if (IsDropDownOpen)
        {
            _holdFilterMode = FilterMode;
            FilterMode = AutoCompleteFilterMode.None;
            ((TextBox)GetTemplateChild("Text")).SelectAll();
        }
        Focus();
    }

    private void AutoCompleteComboBox_TextChanged(object sender, RoutedEventArgs e)
    {
        if (IsDropDownOpen)
        {
            if (FilterMode == AutoCompleteFilterMode.None && FilterMode != _holdFilterMode)
            {
                FilterMode = _holdFilterMode;
            }
            ScrollViewer sv = ((ListBox)GetTemplateChild("Selector")).GetScrollHost();
            if (sv != null)
            {
                sv.ScrollToTop();
            }
        }
    }

    private void AutoCompleteComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (!IsDropDownOpen && SelectedItem == null)
        {
            Text = string.Empty;
        }
    }
}

<Setter Property="Height" Value="24" />
<Setter Property="MinimumPopulateDelay" Value="1" />
<Setter Property="IsTextCompletionEnabled" Value="False" />
<Setter Property="MinimumPrefixLength" Value="0" />
<Setter Property="MaxDropDownHeight" Value="300" />
<Setter Property="IsTabStop" Value="False" />
<Setter Property="Padding" Value="2" />
<Setter Property="BorderThickness" Value="1" />
<Setter Property="BorderBrush" Value="#FF000000" />
<Setter Property="Background" Value="#FFFFFFFF" />
<Setter Property="Foreground" Value="#FF000000" />
<Setter Property="MinWidth" Value="45" />
<Setter Property="FilterMode" Value="Contains" />
<Setter Property="Template">
    <Setter.Value>
        <ControlTemplate TargetType="ctrls:AutoCompleteComboBox">
            <Grid >
                <Grid.Resources>
                    <Style x:Name="comboToggleStyle" TargetType="ToggleButton">
                        <Setter Property="Foreground" Value="#FF333333"/>
                        <Setter Property="Background" Value="#FF1F3B53"/>
                        <Setter Property="BorderBrush">
                            <Setter.Value>
                                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                                    <GradientStop Color="#FFA3AEB9" Offset="0"/>
                                    <GradientStop Color="#FF8399A9" Offset="0.375"/>
                                    <GradientStop Color="#FF718597" Offset="0.375"/>
                                    <GradientStop Color="#FF617584" Offset="1"/>
                                </LinearGradientBrush>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="BorderThickness" Value="1"/>
                        <Setter Property="Padding" Value="3"/>
                        <Setter Property="Template">
                            <Setter.Value>
                                <ControlTemplate TargetType="ToggleButton">
                                    <Grid>
                                        <VisualStateManager.VisualStateGroups>
                                            <VisualStateGroup x:Name="CommonStates">
                                                <VisualState x:Name="Normal"/>
                                                <VisualState x:Name="MouseOver">
                                                    <Storyboard>
                                                        <DoubleAnimation Duration="0" Storyboard.TargetName="BackgroundOverlay" Storyboard.TargetProperty="Opacity" To="1"/>
                                                        <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[3].(GradientStop.Color)" To="#7FFFFFFF"/>
                                                        <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[2].(GradientStop.Color)" To="#CCFFFFFF"/>
                                                        <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)" To="#F2FFFFFF"/>
                                                    </Storyboard>
                                                </VisualState>
                                                <VisualState x:Name="Pressed">
                                                    <Storyboard>
                                                        <DoubleAnimation Duration="0" Storyboard.TargetName="BackgroundOverlay2" Storyboard.TargetProperty="Opacity" To="1"/>
                                                        <DoubleAnimation Duration="0" Storyboard.TargetName="Highlight" Storyboard.TargetProperty="(UIElement.Opacity)" To="1"/>
                                                        <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)" To="#E5FFFFFF"/>
                                                        <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[2].(GradientStop.Color)" To="#BCFFFFFF"/>
                                                        <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[3].(GradientStop.Color)" To="#6BFFFFFF"/>
                                                        <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[0].(GradientStop.Color)" To="#F2FFFFFF"/>
                                                    </Storyboard>
                                                </VisualState>
                                                <VisualState x:Name="Disabled" />
                                            </VisualStateGroup>
                                            <VisualStateGroup x:Name="CheckStates">
                                                <VisualState x:Name="Checked">
                                                    <Storyboard>
                                                        <DoubleAnimation Duration="0" Storyboard.TargetName="BackgroundOverlay3" Storyboard.TargetProperty="(UIElement.Opacity)" To="1"/>
                                                        <DoubleAnimation Duration="0" Storyboard.TargetName="Highlight" Storyboard.TargetProperty="(UIElement.Opacity)" To="1"/>
                                                        <DoubleAnimation Duration="0" Storyboard.TargetName="BackgroundGradient2" Storyboard.TargetProperty="(UIElement.Opacity)" To="1"/>
                                                        <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient2" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)" To="#E5FFFFFF"/>
                                                        <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient2" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[2].(GradientStop.Color)" To="#BCFFFFFF"/>
                                                        <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient2" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[3].(GradientStop.Color)" To="#6BFFFFFF"/>
                                                        <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient2" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[0].(GradientStop.Color)" To="#F2FFFFFF"/>
                                                    </Storyboard>
                                                </VisualState>
                                                <VisualState x:Name="Unchecked"/>
                                            </VisualStateGroup>
                                            <VisualStateGroup x:Name="FocusStates">
                                                <VisualState x:Name="Focused">
                                                    <Storyboard>
                                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="FocusVisualElement" Storyboard.TargetProperty="Visibility" Duration="0">
                                                            <DiscreteObjectKeyFrame KeyTime="0">
                                                                <DiscreteObjectKeyFrame.Value>
                                                                    <Visibility>Visible</Visibility>
                                                                </DiscreteObjectKeyFrame.Value>
                                                            </DiscreteObjectKeyFrame>
                                                        </ObjectAnimationUsingKeyFrames>
                                                    </Storyboard>
                                                </VisualState>
                                                <VisualState x:Name="Unfocused" />
                                            </VisualStateGroup>
                                        </VisualStateManager.VisualStateGroups>
                                        <Rectangle x:Name="Background" RadiusX="3" RadiusY="3" Fill="{TemplateBinding Background}" StrokeThickness="{TemplateBinding BorderThickness}" Stroke="{TemplateBinding BorderBrush}"/>
                                        <Rectangle x:Name="BackgroundOverlay" Opacity="0" RadiusX="3" RadiusY="3" Fill="#FF448DCA" StrokeThickness="{TemplateBinding BorderThickness}" Stroke="#00000000"/>
                                        <Rectangle x:Name="BackgroundOverlay2" Opacity="0" RadiusX="3" RadiusY="3" Fill="#FF448DCA" StrokeThickness="{TemplateBinding BorderThickness}" Stroke="#00000000"/>
                                        <Rectangle x:Name="BackgroundGradient" RadiusX="2" RadiusY="2" StrokeThickness="1" Margin="{TemplateBinding BorderThickness}" Stroke="#FFFFFFFF">
                                            <Rectangle.Fill>
                                                <LinearGradientBrush StartPoint=".7,0" EndPoint=".7,1">
                                                    <GradientStop Color="#FFFFFFFF" Offset="0" />
                                                    <GradientStop Color="#F9FFFFFF" Offset="0.375" />
                                                    <GradientStop Color="#E5FFFFFF" Offset="0.625" />
                                                    <GradientStop Color="#C6FFFFFF" Offset="1" />
                                                </LinearGradientBrush>
                                            </Rectangle.Fill>
                                        </Rectangle>
                                        <Rectangle Opacity="0" x:Name="BackgroundOverlay3" RadiusX="3" RadiusY="3" Fill="#FF448DCA" StrokeThickness="{TemplateBinding BorderThickness}" Stroke="#00000000"/>
                                        <Rectangle Opacity="0" x:Name="BackgroundGradient2" RadiusX="2" RadiusY="2" StrokeThickness="1" Margin="{TemplateBinding BorderThickness}" Stroke="#FFFFFFFF">
                                            <Rectangle.Fill>
                                                <LinearGradientBrush StartPoint=".7,0" EndPoint=".7,1">
                                                    <GradientStop Color="#FFFFFFFF" Offset="0" />
                                                    <GradientStop Color="#F9FFFFFF" Offset="0.375" />
                                                    <GradientStop Color="#E5FFFFFF" Offset="0.625" />
                                                    <GradientStop Color="#C6FFFFFF" Offset="1" />
                                                </LinearGradientBrush>
                                            </Rectangle.Fill>
                                        </Rectangle>
                                        <Rectangle x:Name="Highlight" RadiusX="2" RadiusY="2" Opacity="0" IsHitTestVisible="false" Stroke="#FF6DBDD1" StrokeThickness="1" Margin="{TemplateBinding BorderThickness}" />
                                        <ContentPresenter
                                                  x:Name="contentPresenter"
                                                  Content="{TemplateBinding Content}"
                                                  ContentTemplate="{TemplateBinding ContentTemplate}"
                                                  HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                                  VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                                                  Margin="{TemplateBinding Padding}"/>
                                        <Rectangle x:Name="FocusVisualElement" RadiusX="3.5" Margin="1"  RadiusY="3.5" Stroke="#FF6DBDD1" StrokeThickness="1" Visibility="Collapsed" IsHitTestVisible="false" />
                                    </Grid>
                                </ControlTemplate>
                            </Setter.Value>
                        </Setter>
                    </Style>

                    <ControlTemplate x:Key="CommonValidationToolTipTemplate" TargetType="ToolTip">
                        <Grid x:Name="Root" Margin="5,0" RenderTransformOrigin="0,0" Opacity="0">
                            <Grid.RenderTransform>
                                <TranslateTransform x:Name="Translation" X="-25" />
                            </Grid.RenderTransform>
                            <VisualStateManager.VisualStateGroups>
                                <VisualStateGroup Name="OpenStates">
                                    <VisualStateGroup.Transitions>
                                        <VisualTransition GeneratedDuration="0" />
                                        <VisualTransition To="Open" GeneratedDuration="0:0:0.2">
                                            <Storyboard>
                                                <DoubleAnimation Storyboard.TargetName="Translation" Storyboard.TargetProperty="X" To="0" Duration="0:0:0.2">
                                                    <DoubleAnimation.EasingFunction>
                                                        <BackEase Amplitude=".3" EasingMode="EaseOut" />
                                                    </DoubleAnimation.EasingFunction>
                                                </DoubleAnimation>
                                                <DoubleAnimation Storyboard.TargetName="Root" Storyboard.TargetProperty="Opacity" To="1" Duration="0:0:0.2" />
                                            </Storyboard>
                                        </VisualTransition>
                                    </VisualStateGroup.Transitions>
                                    <VisualState x:Name="Closed">
                                        <Storyboard>
                                            <DoubleAnimation Storyboard.TargetName="Root" Storyboard.TargetProperty="Opacity" To="0" Duration="0" />
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Open">
                                        <Storyboard>
                                            <DoubleAnimation Storyboard.TargetName="Translation" Storyboard.TargetProperty="X" To="0" Duration="0" />
                                            <DoubleAnimation Storyboard.TargetName="Root" Storyboard.TargetProperty="Opacity" To="1" Duration="0" />
                                        </Storyboard>
                                    </VisualState>
                                </VisualStateGroup>
                            </VisualStateManager.VisualStateGroups>

                            <Border Margin="4,4,-4,-4" Background="#052A2E31" CornerRadius="5" />
                            <Border Margin="3,3,-3,-3" Background="#152A2E31" CornerRadius="4" />
                            <Border Margin="2,2,-2,-2" Background="#252A2E31" CornerRadius="3" />
                            <Border Margin="1,1,-1,-1" Background="#352A2E31" CornerRadius="2" />

                            <Border Background="#FFDC000C" CornerRadius="2">
                                <TextBlock UseLayoutRounding="false" Foreground="White" Margin="8,4,8,4" MaxWidth="250" TextWrapping="Wrap" Text="{Binding (Validation.Errors)[0].ErrorContent}" />
                            </Border>
                        </Grid>
                    </ControlTemplate>
                </Grid.Resources>
                <TextBox x:Name="Text" VerticalContentAlignment="Center" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" Foreground="{TemplateBinding Foreground}" MaxLength="{TemplateBinding MaxLength}" />
                <ToggleButton x:Name="PopupToggleButton" Width="24" HorizontalAlignment="Right" Style="{StaticResource comboToggleStyle}" Margin="1" >
                    <Path x:Name="BtnArrow" Height="4" Width="8" Stretch="Uniform" Data="F1 M 301.14,-189.041L 311.57,-189.041L 306.355,-182.942L 301.14,-189.041 Z " HorizontalAlignment="Center">
                        <Path.Fill>
                            <SolidColorBrush x:Name="BtnArrowColor" Color="#FF333333"/>
                        </Path.Fill>
                    </Path>
                </ToggleButton>
                <Border x:Name="ValidationErrorElement" Visibility="Collapsed" BorderBrush="#FFDB000C" BorderThickness="1" CornerRadius="1">
                    <ToolTipService.ToolTip>
                        <ToolTip x:Name="validationTooltip" DataContext="{Binding RelativeSource={RelativeSource TemplatedParent}}" Template="{StaticResource CommonValidationToolTipTemplate}" Placement="Right" PlacementTarget="{Binding RelativeSource={RelativeSource TemplatedParent}}">
                            <ToolTip.Triggers>
                                <EventTrigger RoutedEvent="Canvas.Loaded">
                                    <BeginStoryboard>
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="validationTooltip" Storyboard.TargetProperty="IsHitTestVisible">
                                                <DiscreteObjectKeyFrame KeyTime="0">
                                                    <DiscreteObjectKeyFrame.Value>
                                                        <system:Boolean>true</system:Boolean>
                                                    </DiscreteObjectKeyFrame.Value>
                                                </DiscreteObjectKeyFrame>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </BeginStoryboard>
                                </EventTrigger>
                            </ToolTip.Triggers>
                        </ToolTip>
                    </ToolTipService.ToolTip>
                    <Grid Height="12" HorizontalAlignment="Right" Margin="1,-4,-4,0" VerticalAlignment="Top" Width="12" Background="Transparent">
                        <Path Fill="#FFDC000C" Margin="1,3,0,0" Data="M 1,0 L6,0 A 2,2 90 0 1 8,2 L8,7 z" />
                        <Path Fill="#ffffff" Margin="1,3,0,0" Data="M 0,0 L2,0 L 8,6 L8,8" />
                    </Grid>
                </Border>
                <Popup x:Name="Popup">
                    <ListBox x:Name="Selector" SelectionMode="Single" ScrollViewer.HorizontalScrollBarVisibility="Disabled" ScrollViewer.VerticalScrollBarVisibility="Auto" MaxHeight="{TemplateBinding MaxDropDownHeight}" />
                </Popup>
                <VisualStateManager.VisualStateGroups>
                    <VisualStateGroup x:Name="PopupStates">
                        <VisualStateGroup.Transitions>
                            <VisualTransition GeneratedDuration="0:0:0" To="PopupOpened" />
                            <VisualTransition GeneratedDuration="0:0:0" To="PopupClosed" />
                        </VisualStateGroup.Transitions>
                        <VisualState x:Name="PopupOpened">
                        </VisualState>
                        <VisualState x:Name="PopupClosed">
                        </VisualState>
                    </VisualStateGroup>
                    <VisualStateGroup x:Name="ValidationStates">
                        <VisualState x:Name="Valid" />
                        <VisualState x:Name="InvalidUnfocused">
                            <Storyboard>
                                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ValidationErrorElement" Storyboard.TargetProperty="Visibility">
                                    <DiscreteObjectKeyFrame KeyTime="0">
                                        <DiscreteObjectKeyFrame.Value>
                                            <Visibility>Visible</Visibility>
                                        </DiscreteObjectKeyFrame.Value>
                                    </DiscreteObjectKeyFrame>
                                </ObjectAnimationUsingKeyFrames>
                            </Storyboard>
                        </VisualState>
                        <VisualState x:Name="InvalidFocused">
                            <Storyboard>
                                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ValidationErrorElement" Storyboard.TargetProperty="Visibility">
                                    <DiscreteObjectKeyFrame KeyTime="0">
                                        <DiscreteObjectKeyFrame.Value>
                                            <Visibility>Visible</Visibility>
                                        </DiscreteObjectKeyFrame.Value>
                                    </DiscreteObjectKeyFrame>
                                </ObjectAnimationUsingKeyFrames>
                                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="validationTooltip" Storyboard.TargetProperty="IsOpen">
                                    <DiscreteObjectKeyFrame KeyTime="0">
                                        <DiscreteObjectKeyFrame.Value>
                                            <system:Boolean>True</system:Boolean>
                                        </DiscreteObjectKeyFrame.Value>
                                    </DiscreteObjectKeyFrame>
                                </ObjectAnimationUsingKeyFrames>
                            </Storyboard>
                        </VisualState>
                    </VisualStateGroup>
                </VisualStateManager.VisualStateGroups>
            </Grid>
        </ControlTemplate>
    </Setter.Value>
</Setter>