I just needed something like this, and for I did not find any better solution (Although I am sure I could bind to some windows event, it was an overkiller to my small app), I used a timer, in my case is good enough, not sure in yours thou.


This is the code in the Timer event (my form is modal)

this.Enabled			= .f.

local laObjects(1), lnObjects

lnObjects				= Amouseobj(laObjects, 1)
if lnObjects = 0 or laObjects[1, 2] # this.Parent && The timer is on the form
	* I set here my Return value
	this.Parent.Hide()
endif

this.Enabled			= this.Parent.Visible 

Ah, and the interval I set it to 333 just by testing differnt values