【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