Rendering issues occur when using Hierarchical virtualization mode and bring into view several times. The Headers of some items appear over other Headers.

The feedback item is declined due to duplication with the one below:
http://feedback.telerik.com/Project/143/Feedback/Details/113680-treeview-rendering-issues-when-using-hierarchical-virtualization-mode-and-bring
Please follow it instead.  

This issue is applicable to Silverlight ONLY!

We have a RadTreeView with following properties IsLoadOnDemandEnabled="True", IsVirtualizing="True" and SelectionMode="Extended" set.
We select an element, collapse his parent and select another item. At this point if we expand the previously parent, both the newly selected item and the the first selected item are selected.
It is not correct the first item to preserve its selection state.

Duplicate item: 
https://feedback.telerik.com/Project/143/Feedback/Details/114202-treeview-radtreeviewitem-preserve-its-selection