comctl32/progress: Implement PBM_GETBKCOLOR.

dlls/comctl32/progress.c

@@ -31,7 +31,6 @@
  *
  * Messages:
  *    -- PBM_GETSTEP
- *    -- PBM_GETBKCOLOR
  *    -- PBM_SETSTATE
  *    -- PBM_GETSTATE
  *
@@ -722,6 +721,9 @@ static LRESULT WINAPI ProgressWindowProc(HWND hwnd, UINT message,
 	InvalidateRect(hwnd, NULL, TRUE);
 	return 0;
 
+    case PBM_GETBKCOLOR:
+	return infoPtr->ColorBk;
+
     case PBM_SETMARQUEE:
 	if(wParam != 0)
         {

include/commctrl.h

@@ -484,6 +484,7 @@ static const WCHAR PROGRESS_CLASSW[] = { 'm','s','c','t','l','s','_',
 #define PBM_GETPOS          (WM_USER+8)
 #define PBM_SETBARCOLOR     (WM_USER+9)
 #define PBM_SETMARQUEE      (WM_USER+10)
+#define PBM_GETBKCOLOR      (WM_USER+14)
 #define PBM_GETBARCOLOR     (WM_USER+15)
 #define PBM_SETBKCOLOR      CCM_SETBKCOLOR