When is the Footprint of a Control Set?

alaskanroguealaskanrogue USMember ✭✭✭

When is the footprint (x1,y1,x2,y2) for the interaction with a control set?
At IsEnabled?
At IsVisible?

Does the control need to be visible when it is enabled to define the footprint?

What happens if another control steps on that footprint, i.e. has a footprint that covers the first footprint?

What happens if the other control then steps off, e.g. is made invisible or height and width are set to zero; does the footprint of the original control gain back interaction capabilities? Is there a method(s) that need to be called?

If the control is contained by a grid, what happens when it is made invisible? Visible?

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