Windows ribbon menu [C++]

Hi, i am writting a small application in win32 API, and i use a ribbon menu ( ), but when i get the Device Context of the main windows, and update, the title bar of the windows is redrawed too. So, i try to resize the Device context with a Region, but the opengl doesn’t redraw my window now. How can i do that? (and sorry about my english :S)
My function that initialize opengl is follow :

void Init(HWND hWnd, HDC * hDC, HGLRC * hRC)
int format;

	RECT rc;
	GetClientRect(hWnd, &rc);
	HRGN aaaa ;
	aaaa = CreateRectRgn(rc.left,, rc.right, rc.bottom);

	// get the device context (DC)
	*hDC = GetDC( hWnd );
	SelectObject(*hDC, aaaa);

	// set the pixel format for the DC
	ZeroMemory( &pfd, sizeof( pfd ) );
	pfd.nSize = sizeof( pfd );
	pfd.nVersion = 1;
	pfd.iPixelType = PFD_TYPE_RGBA;
	pfd.cColorBits = 24;
	pfd.cDepthBits = 16;
	pfd.iLayerType = PFD_MAIN_PLANE;
	format = ChoosePixelFormat( *hDC, &pfd );
	SetPixelFormat( *hDC, format, &pfd );

	// create and enable the render context (RC)
	*hRC = wglCreateContext( *hDC );
	wglMakeCurrent( *hDC, *hRC );

Nobody knows a solution?