>I have tried with this control, but I have not been able to assign the database to the control. How do I do this.

You cannot assign the database to the treeview - you should fill the treeview yourself.
You may take a look at some classes and related files from UT Files Section:

Classes-VCX - File#412 Datatree - TreeView Manager
ActiveX controls in VFP File#1086 TreeView Example
ActiveX controls in VFP File#1050 bbFolderTree - treeview with folder list
ActiveX controls in VFP File#9510 Microsoft Treeview 6.0 ActiveX Document.

>Also, it seems this control is just for displaying purposes, but not for selection of particular items or whole groups?
>
You can do anything you want with the selected node.