#2 On ClearTreeView scrollbars don't reset properly

[Anonymous]

Only tested on OSX Snow Leopard.
When you clear a treeview I would expect that also the scrollbars get reset, which is not the case.

An easy workaround:
* Get the root node of the treeview
* Set it's text to empty
* Collapse the root node
* Clear TreeView as normal

This is a hacky way, I know, although it should work across platforms.