You can vheck OleClass property of Treeview.

Ver. 5.0 - COMCTL.TreeCtrl.1
Ver. 6.0 - MSComctlLib.TreeCtrl.2

>How can I told what TreeView Control version is used? eg. v5 or v6
>
>What are the library files I need to distribute/register to client computer?
>
>TIA.
>
>Regards,