Ah yes, I think I know what you are trying to do, I'm assuming you want to have an inventory bag in the corner somewhere. When you click on it, it will bring up the actual inventory?
What you want to do is make two separate interfaces, one with the bag animation, and one with the actual inventory.
actually covers it, look under
"Part 8 Inventory Sam and Max style" And it outlines what you want to do.
The only difference for you is that your "inventory off" interface will have a 'mouse over' animation.
To make it stop on the last frame you can change the individual frames speed to 0 (or -1 I can't remember). And when the mouse leaves the action area you can use the action " Play/hide animation" and tick hide.