Hi Tom.

>I want to use the checkbox to show that childnodes exist or not.

Why do you need to do it that way? The + sign in front of a node indicates there are child nodes. That's the best way to do it because:

- it's automatic (the TreeView does this for you without you lifting a finger

- it's the way other TreeViews (like Window Explorer) do it, so your users will expect it

Doug