WPF and Silverlight Toolkit Compatibility
General Compat Thoughts The majority of the controls in the Silverlight Toolkit November 2008 (PDC) release are Silverlight versions of controls already present in WPF. These "WPF Parity" controls include: DockPanel WrapPanel ViewBox Label Expander TreeView HeaderedContentControl HeaderedItemsControl We focused heavily on API compatibility for these controls, only making changes (I'm actually not sure if there were any) for things that aren't currently possible on the Silverlight 2 runtime. And some things, like supporting Visual State Manager, required internal changes that made the process more complicated than just copying the existing WPF code. We did leverage the WPF control specs and use the WPF controls behavior
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Read the complete post at http://blogs.msdn.com/sburke/archive/2008/11/11/wpf-and-silverlight-toolkit-compatibility.aspx