WM_CONTROL (in Button Controls) Field - usnotifycode

usnotifycode (USHORT)

Notification code.

The notification code BN_PAINT is only generated when the button control has a style of BS_USERBUTTON.

The button control uses these notification codes:

BN_CLICKED

The button has been pressed.
BN_DBLCLICKED
The button has been double-clicked.
BN_PAINT
The button requires painting, using one of the following draw states:

BDS_DISABLED

The disabled state of the button requires painting.
BDS_HILITED
The highlighted state of the button requires painting.
BDS_DEFAULT
The default state of the button requires painting.

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