Hi Claudio Duarte,
We investigatde this further and it appeared that there is a limitation in the number of nested elements that comes from the Silverlight Framework. This number varies depending of the type of the elements. We made a small test that shows that you cannot nest more than 80 Buttons for example. So, the exception that raises when having 50-60 nested RadTreeViewItems is expected.
Please accept my apologies for any inconvenience caused previously.
the Telerik team
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