Thank you for reporting this issue.
I logged it in our PITS
under the name: TreeView: BringItemIntoView and BringIndexIntoView methods don't bring the requested item into view if the TreeView is Virtualized and some of its items are expanded
. I also updated your Telerik points accordingly.
Also I prepared a sample project illustrating how to set the IsSelected and isExpaned properties of the RadTreeViewItems using TwoWay binding. This approach allows to search through the tree items and select the items you need and respectively bring them into view.
Please take a look at the project and let me know if this is what you had in mind.
Also, if you want to reduce the size of your Silverlight application, you should check our latest Silverlight tool online - Assembly Minifier (http://blogs.telerik.com/blogs/posts/10-06-10/telerik_assembly_minifier.aspx
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