It does work. There is another bug in the tree!

svn path=/trunk/; revision=29031

reactos/dll/win32/user32/windows/defwnd.c

@@ -1058,7 +1058,8 @@ User32DefWindowProc(HWND hWnd,
         }
 
         case WM_LBUTTONDBLCLK:
-//            return (DefWndNCLButtonDblClk(hWnd, HTCLIENT, lParam));            
+            return (DefWndNCLButtonDblClk(hWnd, HTCLIENT, lParam));            
+
         case WM_NCLBUTTONDBLCLK:
         {
             return (DefWndNCLButtonDblClk(hWnd, wParam, lParam));