public void WndProcRet(object sender, WndProcRetEventArgs e)
        {
            if (e.cw.message == WndMessage.WM_INITDIALOG ||
                e.cw.message == WndMessage.WM_UNKNOWINIT)
            {
                USER32.MoveWindow(e.cw.hwnd, rect.Left, rect.Top, rect.Width, rect.Height, 1);

                // uninstall this hook
                WindowsHook wndHook = (WindowsHook)sender;
                Debug.Assert(wndProcRetHook == wndHook);
                wndProcRetHook.Uninstall();
                wndProcRetHook = null;
            }
        }
        public void WndProcRet(object sender, WndProcRetEventArgs e)
        {
            switch (e.cw.message)
            {
            case WndMessage.WM_INITDIALOG:
            case WndMessage.WM_UNKNOWINIT:
            case WndMessage.WM_ACTIVATE:    //tony 2011.3.12 update 这是能否显示在当前父窗体中央的关键!
                USER32.MoveWindow(e.cw.hwnd, rect.Left, rect.Top, rect.Width, rect.Height, 1);
                // uninstall this hook
                WindowsHook wndHook = (WindowsHook)sender;
                Debug.Assert(wndProcRetHook == wndHook);
                wndProcRetHook.Uninstall();
                wndProcRetHook = null;
                break;

            default: break;
            }
        }