>How can I detect minimize event of the form and windows?
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You can use BINDEVENT() function to bind to the _SCREEN resize event. Sample code

PUBLIC oHandler
oHandler=NEWOBJECT("Resizer")
BINDEVENT(_SCREEN,"Resize",oHandler,"Resize")

DEFINE CLASS Resizer AS Custom
	PROCEDURE Resize
		DEBUGOUT _SCREEN.WindowState 
	ENDPROC
ENDDEFINE