>Two listbox in two different containers. I set the visible
>property of containers only. For the use of Zorder, I tested
>on the containers and no result.

Since ZOrder didn't work, try moving the container when you make it invisible. You could move it to something like -100,-100 to get it out of the way just in case it is messing with you. When you make it visible, move it back.

>I do not konw the SET SWAG ON/OFF
>command. I used the VFP 6. May be it's a new command in VFP 7 ???

SWAG = Scientific Wild Ass Guess
A wild ass guess with a little thought behind it.