[Zonx]

I WISH: we had a ResizeLoc similar to PackLoc that sets an anchor for resizing. Currently resize always grows/shrinks from the top left corner.

Edit: I'm thinking something along these lines...

ResizeLocation="Center,Top"
Usual 3 possible alignment options for horizontal and vertical, Left/Right/Center,Top/Center/Bottom.

For example, ResizeLocation="Center,Center" would result in a window that, when shrunk, would pull all corners in towards center. Right,Top would pull the left-bottom corner up to the right. Child objects would of course reposition relative to the parent object's new anchor point locations.