C# Constants:

    /// <summary>
    /// The initial state of the frame control.
    /// </summary>
    [Flags()]
    public enum DrawFrameControlStates : uint
    {
        // =====================================================================================
        // If uType is DFC_BUTTON, uState can be one of the following values.
        // =====================================================================================
        /// <summary>
        /// Check box
        /// </summary>
        DFCS_BUTTONCHECK = 0,
        /// <summary>
        /// Image for radio button (nonsquare needs image)
        /// </summary>
        DFCS_BUTTONRADIOIMAGE = 1,
        /// <summary>
        /// Mask for radio button (nonsquare needs mask)
        /// </summary>
        DFCS_BUTTONRADIOMASK = 2,
        /// <summary>
        /// Radio button
        /// </summary>
        DFCS_BUTTONRADIO = 4,
        /// <summary>
        /// Three-state button
        /// </summary>
        DFCS_BUTTON3STATE = 8,
        /// <summary>
        /// Push button
        /// </summary>
        DFCS_BUTTONPUSH = 0x10,
        // =====================================================================================
        // If uType is DFC_CAPTION, uState can be one of the following values.
        // =====================================================================================
        /// <summary>
        /// Close button
        /// </summary>
        DFCS_CAPTIONCLOSE = 0,
        /// <summary>
        /// Minimize button
        /// </summary>
        DFCS_CAPTIONMIN = 1,
        /// <summary>
        /// Maximize button
        /// </summary>
        DFCS_CAPTIONMAX = 2,
        /// <summary>
        /// Restore button
        /// </summary>
        DFCS_CAPTIONRESTORE = 3,
        /// <summary>
        /// Help button
        /// </summary>
        DFCS_CAPTIONHELP = 4,
        // =====================================================================================
        // If uType is DFC_MENU, uState can be one of the following values.
        // =====================================================================================
        /// <summary>
        /// Submenu arrow
        /// </summary>
        DFCS_MENUARROW = 0,
        /// <summary>
        /// Check mark
        /// </summary>
        DFCS_MENUCHECK = 1,
        /// <summary>
        /// Bullet
        /// </summary>
        DFCS_MENUBULLET = 2,
        /// <summary>
        /// Submenu arrow pointing left. This is used for the right-to-left cascading menus used with right-to-left languages such as Arabic or Hebrew.
        /// </summary>
        DFCS_MENUARROWRIGHT = 4,
        // =====================================================================================
        // If uType is DFC_SCROLL, uState can be one of the following values.
        // =====================================================================================
        /// <summary>
        /// Up arrow of scroll bar
        /// </summary>
        DFCS_SCROLLUP = 0,
        /// <summary>
        /// Down arrow of scroll bar
        /// </summary>
        DFCS_SCROLLDOWN = 1,
        /// <summary>
        /// Left arrow of scroll bar
        /// </summary>
        DFCS_SCROLLLEFT = 2,
        /// <summary>
        /// Right arrow of scroll bar
        /// </summary>
        DFCS_SCROLLRIGHT = 3,
        /// <summary>
        /// Combo box scroll bar
        /// </summary>
        DFCS_SCROLLCOMBOBOX = 5,
        /// <summary>
        /// Size grip in lower-right corner of window
        /// </summary>
        DFCS_SCROLLSIZEGRIP = 8,
        /// <summary>
        /// Size grip in lower-left corner of window. This is used with right-to-left languages such as Arabic or Hebrew.
        /// </summary>
        DFCS_SCROLLSIZEGRIPRIGHT = 0x10,
        // =====================================================================================
        // The following style can be used to adjust the bounding rectangle of the push button.
        // =====================================================================================
        /// <summary>
        /// Bounding rectangle is adjusted to exclude the surrounding edge of the push button.
        /// </summary>
        DFCS_ADJUSTRECT = 0x2000,
        // =====================================================================================
        // One or more of the following values can be used to set the state of the control to be drawn.
        // =====================================================================================
        /// <summary>
        /// Button is inactive (grayed).
        /// </summary>
        DFCS_INACTIVE = 0x100,
        /// <summary>
        /// Button is pushed.
        /// </summary>
        DFCS_PUSHED = 0x200,
        /// <summary>
        /// Button is checked.
        /// </summary>
        DFCS_CHECKED = 0x400,
        /// <summary>
        /// The background remains untouched. This flag can only be combined with DFCS_MENUARROWUP or DFCS_MENUARROWDOWN.
        /// </summary>
        DFCS_TRANSPARENT = 0x800,
        /// <summary>
        /// Button is hot-tracked.
        /// </summary>
        DFCS_HOT = 0x1000,
        /// <summary>
        /// Button has a flat border.
        /// </summary>
        DFCS_FLAT = 0x4000,
        /// <summary>
        /// Button has a monochrome border.
        /// </summary>
        DFCS_MONO = 0x8000
    }

Alternative Managed API:

Notes:

Tips & Tricks:

// undocumented DrawFrameControl styles

#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 */

but I can't see any differences in drawing of the buttons so prob' haven't got any meaning in Windows.

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.

Sample Code:

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).