Thank you for this report.
Indeed there is a problem with refresh of the RadTreeView wrapper, after expand/collapse of a RadTreeViewItem.
We have logged this issue and will our best to fix it in our upcoming release(s).
Meanwhile there is a fast/easy workaround of this issue. You just have to invoke the following:
right after the "Last" node is expanded.
Here is an example:
I hope that this solution is acceptable for you.
Your Telerik points are updated according your report.
the Telerik team
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