如何在visual c++win32 API中改变应用程序主窗口的边框样式

我在Visual c++(Win32 API)中有一个应用程序。在我的应用程序中,主窗口边框以旧窗口样式显示。我已经尝试将wndWc.style值更改为WS_OVERLAPPED、WS_pop up和WinUser.h中提供的其他值,但是主窗口的外观没有任何更改,因为我的所有弹出窗口都是以windows 7样式显示的,如何纠正这种情况。在这方面的任何帮助都将不胜感激。我在主窗口和弹出窗口都附上了图片。

代码:

// our window class
  WNDCLASS wndWc;
  // ---------------------------------------------------------
  // fill window class members
  // ---------------------------------------------------------
  wndWc.style = CS_GLOBALCLASS;
  wndWc.lpfnWndProc = (WNDPROC) WndProc;
  wndWc.cbClsExtra = 0;
  wndWc.cbWndExtra = 0;
  wndWc.hInstance = GetModuleHandle(NULL);
  wndWc.hIcon = NULL;
  wndWc.hCursor = LoadCursor(0, IDC_ARROW);
  wndWc.hbrBackground = (HBRUSH)GetStockObject(0);
  wndWc.lpszMenuName = NULL;
  wndWc.lpszClassName = "XYZ";


  // register class
  if (!RegisterClass(&wndWc)) return false;
  // ---------------------------------------------------------

  // get actual screen resolution
  int iSw = (WORD)GetSystemMetrics(SM_CXSCREEN);       // height
  int iSh = (WORD)GetSystemMetrics(SM_CYSCREEN);       // height

  // make a rectangle on the center of the screen
  RECT rc = {(iSw - iWidth)/2, (iSh - iHeight)/2, width, height};

  // create the window. the spaces on the window title
  // are just to make sure this will be visible when the region
  // is active. just run the app and you'll understand. =)
  hWnd = CreateWindow("XYZ", "XYZ",
                      WS_OVERLAPPEDWINDOW,
                      CW_USEDEFAULT,CW_USEDEFAULT, width,height,
                      NULL, NULL, GetModuleHandle(NULL), NULL);