How can I change the visibility of elements inside a DataTemplate when a row is selected in a Silverlight datagrid?

There are a couple ways you could do this in silverlight, although I don't think any of them can be pure XAML solutions. With MVVM, you then create property in your view model that you bind to the SelectedItem property of the DataGrid. From there, there are two differnt options.

If only Silverlight had a RelativeSource FindAncestor binding...

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