[MaxGUI] multiple windows...

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degac

I have a new problem :)
I have a main window and a secondary window. If I close the secondary window the program intercept the event 'Close window' and stop the program.
How can I know WHO is the Source of the close event? I tried with EventSource() that should return the source object but I have an error...or probably I miss something!
Please clarify me!
Thanks

Global win_main:tgadget
Global win_opt:tgadget

win_main=CreateWindow("Main Window",50,50,200,200)
win_opt=CreateWindow("Option",100,100,100,100)

While WaitEvent()
	evID=EventID()
	evsource=EventSource()
	Select EventID()
		Case EVENT_WINDOWCLOSE
			evSource=EventSource()'???? <---tgadget(EventSource())?
			evID=EventID()
			
			If evSource=win_opt And win_opt<>0 FreeGadget win_opt
			If evSource=win_main
				If win_opt<>Null FreeGadget win_opt
				FreeGadget win_main
				End
			End If
	EndSelect
Wend