设置菜单底色

GetMenuItemCount,DrawMenuBar,GetSubMenu,GetMenu,SetMenuInfo,CreateSolidBrush,DeleteObject,CreatePatternBrush,取菜单条目数_,重画菜单_,取菜单句柄_,置菜单信息_,创建纯色刷子_,取子菜单句柄_,取菜单信息_