is a ContentControl
so you can add any UIElement
as a content. Could you please read this
article and if you still have questions feel free to ask.
On a side note, I'd like to inform you that we've just released an online tool that allows you to reduce the size of your Silverlight applications. For more information, please visit http://blogs.telerik.com/blogs/posts/10-06-10/telerik_assembly_minifier.aspx
the Telerik team
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