In the new version Q1 2011, we have redesigned the RadTreeView control. Now instead of custom painting, we are using visual element hierarchy that comes out of the box with Telerik Presentation Framework. Hence, every element is responsible for raising its events. If many customers complain about the illustrated behavior, we will consider it as an issue. In the meantime, you can use the NodeFormatting event to enable the old event life cycle:
sender, TreeNodeFormattingEventArgs e)
I hope this helps.
the Telerik team
Q1’11 SP1 of RadControls for WinForms is available for download
; also available is the Q2'11 Roadmap
for Telerik Windows Forms controls.