Hi,

I've created a combined List-and Treeview, just as you see in Explorer.
When I resize the form with the List-and Treeview on it,  I can easily
resize the List-and Treeview. When I click the left mouse button at
the space just between the List-and treeview and hold it, I want to
be to change the surface of both elements by either moving the
mouse to the left or right, just like in Explorer. Anyone any
idea on how to do this ?

thanks

Run the application wizard, ask for an "explorer-type" application, and see
how it does it.  You can easily paste it into your own app.

Jim Deutch
MS Dev MVP