You can find an article showing how to change the expander of the RadTreeView here
In order to change the icon that is used when a particular RadTreeViewItem
is Loading-On-Demand, you can edit the style of the item via Expression Blend
and change the LoadingVisual
Grid placed in the ListRootContainer Grid
. The described approach is used in the attached project , so give it a try and let us know how it goes.
the Telerik team
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