How to make a control sizeable with mouse

[furk]

Hi,
I'm developing an application which has a treeview and a crystal report viewer. There are a lot of other stuff too, but I want to make the user be able to change the size of the treeview with the mouse (see the picture)

http://imageshack.us/photo/my-images/3/mousedrag.png/

how can I do this?

thanks in advance..

[Unhnd_Exception]

Use a split container and put the treeview into panel 1. Set the treeview's dock to fill.

[k.d.m]

Use mouse click and drag events. Inside the drag event if control is being clicked change the size according to the moved position.