The BN_DOUBLECLICKED notification message is sent when the user double-clicks a button that has the BS_OWNERDRAW or BS_RADIOBUTTON style. The parent window of the button receives this notification message through the WM_COMMAND message.
BN_DOUBLECLICKED
BN_DOUBLECLICKED is the same as the BN_DBLCLK notification message.
This notification is provided for compatibility with applications written for versions of Windows earlier than version 3.0. New applications should use the BS_OWNERDRAW button style and the DRAWITEMSTRUCT structure for this task.