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The description of the ID& parameter is incorrect. It should be:
ID& is the unique control identifier number (in the range 1 to 65535) as assigned with the CONTROL ADD GRAPHIC statement. ID& must be 0 for a GRAPHIC WINDOW or GRAPHIC BITMAP.
ID& is the unique control identifier number (in the range 1 to 65535) as assigned with the CONTROL ADD GRAPHIC statement. ID& must be 0 for a GRAPHIC WINDOW or GRAPHIC BITMAP.