WM_CONTROL Field - usnotifycode

usnotifycode (USHORT)

The notification codes that indicate what action has occurred.

GBN_BUTTONUP

Returned when the button is in the Up position. param2 is reserved.
GBN_BUTTONDOWN
Returned when the button is in the Down position. param2 is reserved.
GBN_BUTTONHILITE
Returned when the button is selected to the On position. param2 is reserved.
GBN_SETFOCUS
Returned when the button is gaining or losing focus. param2 is reserved.

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