I'm trying to display a progress bar after a Ctrl-Alt-Del passsword
change using non-MFC dialogs, but the UI locks up while displaying
child dialogs shortly there after on roughly half of the XP machines
I've tested on.  The same child dialogs work fine when the progress
dialog isn't displayed.  Anyone know of any gotchas using comctl32 from
a system process?  Here's the code that displays the progress dialog:

=================================
/* Initializing the dialog */
INITCOMMONCONTROLSEX InitCtrlEx;
InitCtrlEx.dwSize = sizeof(INITCOMMONCONTROLSEX);
InitCtrlEx.dwICC  = ICC_PROGRESS_CLASS;
InitCommonControlsEx(&InitCtrlEx);

HWND hProgressWnd = CreateDialogParam(hInstance,
MAKEINTRESOURCE(IDD_PROGRESS), GetTopWindow(0),
(DLGPROC)ProgressDlgProc, NULL);

ShowWindow(hProgressWnd, SW_SHOWNORMAL);
UpdateWindow(hProgressWnd);
=================================
/* Window proc */
BOOL CALLBACK ProgressDlgProc(HWND hWndDlg, UINT Msg, WPARAM wParam,
LPARAM lParam) {
   switch(Msg) {
   case WM_INITDIALOG:
      SendDlgItemMessage(hWndDlg, IDC_PROGRESS, PBM_SETSTEP, (WPARAM)
1, 0);
      SendDlgItemMessage(hWndDlg, IDC_PROGRESS, PBM_SETRANGE, 0,
MAKELPARAM(0, 5));
      return TRUE;

   case WM_COMMAND:
      switch(wParam) {
      case IDOK:
         EndDialog(hWndDlg, 0);
         return TRUE;
      }
      break;
   }
   return FALSE;

=================================
/* How the dialog is updated */
SendDlgItemMessage(hProgressWnd, IDC_PROGRESS, PBM_STEPIT, 0, 0);
UpdateWindow(hProgressWnd);
=================================

   -Gregg