Windows phone 7 WP7.1中未呈现自定义控件

我想在WP7.1中创建水印文本框，我遵循了链接

但该自定义控件不会在主页中呈现。我做错了什么

WaterMarkTextBox.cs

public class WaterMarkTextBox : TextBox
    {
        public WaterMarkTextBox()
        {
            DefaultStyleKey = typeof(WaterMarkTextBox);
        }
    }

WaterMarkTextBoxStyle.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:vsm="clr-namespace:System.Windows;assembly=System.Windows"
    xmlns:local="clr-namespace:MyCustomControls">
    <Style TargetType="local:WaterMarkTextBox">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="local:WaterMarkTextBox">
                    <Grid>
                        <Border>
                            <ContentControl x:Name="ContentTextBox" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}"/>
                        </Border>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>

样本：

包括以下内容

xmlns:local=“clr命名空间：MyCustomControls；assembly=MyCustomControls”

---

解决方案：我添加了边界笔刷、边界厚度和背景色。现在工作正常。

    <ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:vsm="clr-namespace:System.Windows;assembly=System.Windows"
xmlns:local="clr-namespace:customcontrols">
<Style TargetType="local:WaterTextBox">
    <Setter Property="Background" Value="{StaticResource PhoneTextBoxBrush}"/>
    <Setter Property="Foreground" Value="{StaticResource PhoneTextBoxForegroundBrush}"/>
    <Setter Property="BorderBrush" Value="{StaticResource PhoneTextBoxBrush}"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="local:WaterTextBox">
                <Grid Background="Transparent">
                    <Border x:Name="EnabledBorder" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Margin="{StaticResource PhoneTouchTargetOverhang}">  
                            <ContentControl x:Name="ContentElement" BorderThickness="0" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch"/>                          
                    </Border>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

多谢各位