Resizing controls...?

[Facundooz]

I have a little problem with a form. I have in it two controls, a treeview showing some tasks, and a textbox showing the content of each task.
I need to resize (with the mouse) the limits between the two controls, because one may be greater than the other. How can I do it??????
I think about it in some like the explorer of Windows 9.x, or the MSOutlook, do you understand?
I suppose there is an OCX that can do this, or perharps I must do it with code?
Thanks in advance, and excuse me for my bad english...

[simonm]

You could achieve this in code although it would be much easier with an appropriate third party control.

I use the Sheridan (now Infragistics) splitter control.

This control is a container that can be easily split into as many panes as required. This allows the user to resize the panes (which in turn automatically resize the contents of those panes).

I don't know if you can buy that control individually though, they probably bundle it with a few others.