inputbox negative x and y values

$pass1 = InputBox(" " , " " , "Default1" , " M8" , 100 , 100, -20, -20)
msgbox (0, '' , $pass1)

$pass2 = InputBox(" " , " " , "Default2" , " M8" , 100 , 100, -120, -120)
msgbox (0, '' , $pass2)

the first example inputbox straddles my dual monitor setup, works fine.  But when i push it off the edge of the primary with the second example the inputbox fails to display and not even the default text is captured.  Any thoughts?