I prepared a sample project for you that uses the PreviewExpanded
event of the RadTreeView? Could you please give it a try and let us know if it points you in the right direction ?
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items