Hi Rami Abughazaleh,
The current CTP version of the TreeListView does not have a specific event that can be used. By the end of the week we will release the Q2 beta where you will be able to handle the
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.