SETFOCUS Submesssages

• SETFOCUS_NORMAL (0): A LOSEFOCUS message is sent to the old focus window after the new focus window receives this SETFOCUS message.
• SETFOCUS_NOLOSE (1): This submessage supresses a LOSEFOCUS message being sent to the old focus window.
• SETFOCUS_SELECT (2): The window receives the focus, and does an implicit selection. This submessage is only used for CheckBoxes, and is equivalent to pressing <Space> immediately after the checkbox receives the focus.