>>Do you mean only to extend them up/down or sideways also?
>
>up/down
>
>>If up/down only, I would put a vertical slider beside them and have the code to change the height/position of both.
>
>Interesting, I'll investigate on that.

Remember, that if you want to overlap one another when resizing, then you cannot overlap the treeview with editbox, since ActiveX control will be always on top.