C# ContextMenu导致所有其他UI元素不可访问

我有两个具有以下样式的上下文菜单：

    <Style TargetType="{x:Type ContextMenu}" x:Key="ListBoxContextMenu">
        <Setter Property="BorderBrush" Value="White"/>
        <Setter Property="BorderThickness" Value="0"/>
        <Setter Property="Background" Value="White"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ContextMenu}">
                    <Border Margin="14" Background="White">
                        <Border.Effect>
                            <DropShadowEffect Opacity="0.999" BlurRadius="8" ShadowDepth="0"/>
                        </Border.Effect>
                        <StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Cycle"/>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

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我有一种预感，是MouseDown和MouseMove事件导致了这个问题。如果有人能发现问题或需要更多信息，请告诉我。提前谢谢。

没关系。我解决了这个问题。我所做的是，去掉UIElement while语句和相关代码。然后我用一个简单的TryCast（sender，ListBoxItem）替换了它。如果你需要更详细的解释，请让我知道，我会给你回复

Private Sub ReferenceListItemMouseDown(sender As Object, e As MouseButtonEventArgs)
    Dim PW As MainWindow = Window.GetWindow(MainPage)
    StartPoint = e.GetPosition(Nothing)
    PW.Resizing = False
End Sub

Private Sub ReferenceListItemMouseMove(sender As Object, e As MouseEventArgs)
    Dim PW As MainWindow = Window.GetWindow(MainPage)
    If PW.Resizing = False Then
        Dim MousePosition As Point = e.GetPosition(Nothing)
        Dim Difference As Vector = StartPoint - MousePosition
        Dim StopDrop As Boolean
        If e.LeftButton = MouseButtonState.Pressed AndAlso (Math.Abs(Difference.X) > SystemParameters.MinimumHorizontalDragDistance Or Math.Abs(Difference.Y) > SystemParameters.MinimumVerticalDragDistance) Then
            Dim LB As ListBox = ReferenceList
            Dim UIE As UIElement = LB.InputHitTest(MousePosition)
            If UIE IsNot Nothing Then
                Dim Data As Object = DependencyProperty.UnsetValue
                While Data Is DependencyProperty.UnsetValue And UIE IsNot Nothing
                    Data = LB.ItemContainerGenerator.ItemFromContainer(UIE)
                    If Data Is DependencyProperty.UnsetValue Then
                        UIE = VisualTreeHelper.GetParent(UIE)
                    End If
                    If UIE Is LB Then
                        StopDrop = True
                    End If
                End While
                If Data IsNot DependencyProperty.UnsetValue Then
                    StopDrop = False
                End If
            Else
                StopDrop = True
            End If
            PW.TempItem = LB.SelectedItem
            Dim FN As String = PW.TempItem.PropLastName & ", " & PW.TempItem.PropFirstName.Substring(0, 1)
            Dim TT As String = PW.TempItem.PropTitle
            Dim YR As String = PW.TempItem.PropYear.ToString
            Dim ReferenceText As String = FN & " " & YR & ", " & TT
            Dim DragData As DataObject = New DataObject(DataFormats.StringFormat, ReferenceText)
            If DragData IsNot Nothing And StopDrop = False Then
                DragDrop.DoDragDrop(sender, DragData, DragDropEffects.Copy)
            End If
        End If
    End If

End Sub