.

        DFCS_BUTTONCHECK = 0,

.

        DFCS_BUTTONRADIOIMAGE = 1,

.

        DFCS_BUTTONRADIOMASK = 2,

.

        DFCS_BUTTONRADIO = 4,

.

        DFCS_BUTTON3STATE = 8,

.

        DFCS_BUTTONPUSH = 0x10,

.

        DFCS_CAPTIONCLOSE = 0,

.

        DFCS_CAPTIONMIN = 1,

.

        DFCS_CAPTIONMAX = 2,

.

        DFCS_CAPTIONRESTORE = 3,

.

        DFCS_CAPTIONHELP = 4,

.

        DFCS_MENUARROW = 0,

.

        DFCS_MENUCHECK = 1,

.

        DFCS_MENUBULLET = 2,

.

        DFCS_MENUARROWRIGHT = 4,

.

        DFCS_SCROLLUP = 0,

.

        DFCS_SCROLLDOWN = 1,

.

        DFCS_SCROLLLEFT = 2,

.

        DFCS_SCROLLRIGHT = 3,

.

        DFCS_SCROLLCOMBOBOX = 5,

.

        DFCS_SCROLLSIZEGRIP = 8,

.

        DFCS_SCROLLSIZEGRIPRIGHT = 0x10,

.

        DFCS_ADJUSTRECT = 0x2000,

.

        DFCS_INACTIVE = 0x100,

.

        DFCS_PUSHED = 0x200,

.

        DFCS_CHECKED = 0x400,

.

        /// The background remains untouched. This flag can only be combined with DFCS_MENUARROWUP or DFCS_MENUARROWDOWN.

.

        DFCS_TRANSPARENT = 0x800,

.

        DFCS_HOT = 0x1000,

.

        DFCS_FLAT = 0x4000,

.

        DFCS_MONO = 0x8000

.

#define DFCS_MENUARROWUP 0x0008 /* scroll menu up */

.

#define DFCS_MENUARROWDOWN 0x0010 /* scroll menu down */

.

#define DFCS_INMENU 0x0040 /* modifier for DFC_MENU as captionbtn drawn in systemmenu */

.

#define DFCS_INSMALL 0x0080 /* modifier for DFC_MENU as captionbtn for WS_EX_TOOLWINDOW */

.

UPDATE

I've found the DFCS_INxxx constants at http://www.reactos.org/wiki/Techwiki:Win32k/SERVERINFO

.

The buttons are drawn by vectors so to draw a "menu" close icon simply draw a DFCS_CAPTIONCLOSE button with the size of SM_CXMENUCHECK/SM_CYMENUCHECK.