Hi m v klingeren,
Sorry for the delayed reply. What exactly do you mean by saying:
if you now use the Selected /or MouseLeftButtonUp) events of the childs (ie <telerikNavigation:RadPanelBarItem Header="Content1.1"/>)
I ran Tina's project and the PanelBar behaved as expected. I've attached a video demonstrating my interaction with the PanelBar. On expand, the first sub-item gets selected. After that I am able to successfully select another item and deselect the programatically selected item.
Is it something else you have on your end. I'd be glad if can attach a sample project reproducing the issue. This way we will be better able to assist you.
On a side note, I'd like to inform you that we've just released an online tool that allows you to reduce the size of your Silverlight applications. For more information, please visit http://blogs.telerik.com/blogs/posts/10-06-10/telerik_assembly_minifier.aspx
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