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_ConvertScreenToWindowCoords
Converts the screen coordinates of a specified point on the screen to window control coordinates.
Prototype :
fun [ObjWin I I] [I I]
- ObjWin : a window control.
- I : the 'x' coordinate.
- I : the 'y' coordinate.
Return : [I I] the 'x' and 'y' converted coordinates, NIL otherwise
See also :
Example :