Select Silverlight Treeview Item using MVVM Pattern

Can anyone tell me,Please include code, how to select a treeviewitem using the MVVM Patt开发者_Go百科ern

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This post had a code example that was using a Tree View, with MVVM suggestions.

I have the solution in a zip file to that I could send you (from the answer to the link) if you would like them.