visible flag based on another window?

[betabry]

I'm not sure if this is possible but I'm hoping to find a way to do it.

What I want to do is have a single target window of X size

But when the implied target window is shown I want the target window to resize(or just the components of it) so that the implied window can overlay half of the target window without taking up any extra space.

Just using the health bar as an example if it is 100 pixels long I want it to shrink to 50 pixels when I have an implied target.

I'm thinking I could do it using 2 separate pages for the target window and just switching the visible tag but is it possible to have the implied target window becoming visible trigger the switch in the main target window?

Or if you have any other suggestions as to how I could acomplish this I'd appreciate it.

Thanks in advance