【Windows API】Button Control Structures

①BUTTON_IMAGELIST

Contains information about an image list that is used with a button control

②BUTTON_SPLITINFO

Contains information that defines a split button (BS_SPLITBUTTON and BS_DEFSPLITBUTTON styles)

③NMBCDROPDOWN

Contains information about a BCN_DROPDOWN notification

④NMBCHOTITEM

Contains information about the movement of the mouse over a button control

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原文：http://www.cnblogs.com/Cxx-Code/p/3632083.html