internal static extern int SetMenuItemBitmaps(HMenu hmenu, int nPosition, MFMENU uflags, IntPtr hBitmapUnchecked, IntPtr hBitmapChecked);

static extern bool SetMenuItemBitmaps(IntPtr hMenu, uint uPosition,

        public static extern int SetMenuItemBitmaps(IntPtr hMenu, IntPtr nPosition, int wFlags, IntPtr hBitmapUnchecked, IntPtr hBitmapChecked);

            return  SetMenuItemBitmaps(mi.Parent.Handle,(IntPtr) mi.Index,MF_BYPOSITION,intp,intp);