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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