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SilverLight 2 Beta2 中找不到 WatermarkedTextBox

问题
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大家好:
我安装了SilverLight2 beta2版,并安装了SilverLight Tools for VS2008。我在开发SilverLight Application的时候,发现在 SilverLight2 beta1版中使用的WatermarkedTextBox在开发环境中报错,代码如下:
Code Snippet<Border Style="{StaticResource TitleBorder}">
<TextBlock Text="DIGG SEARCH" Style="{StaticResource TitleText}" />
</Border><WatermarkedTextBox x:Name="txtSearchTopic" Watermark="Topic..." FontFamily="Trebuchet MS" Grid.Column="1" FontSize="12" Padding="1,3,1,1"/>
<Button x:Name="btnSearch"
Content="Search"
Click="SearchBtn_Click"
Style="{StaticResource SearchButton}" />错误信息是:Error 2 The type 'WatermarkedTextBox' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built. E:\My Program\Example Project\SilverLight\DiggSample\DiggSample\Page.xaml 25。
我发现在ToolBox中没有'WatermarkedTextBox控件。请问在SilverLight2 beta2中是否还有'WatermarkedTextBox控件,谢谢!