Currently there is no way to get a notification when the nodes collection is changed (i.e. when a node is added/removed). We have this feature scheduled for the Q1 2008 release (due in mid April).
Regarding the Edited
event. Could you please tell me what actions you perform to fire that exception. It would be best if you send a sample code so that I can reproduce and fix the issue.
Thank you for your cooperation.
All the best,
the Telerik team