Creating a dialog in a thread

Hi,

I have a question regarding to create a dialog in a thread. My design is: when the main program is about to start a lengthy compuataion, it new a thread and a dialog window is launched from the newly created thread. The lenghty computation is kept in the main program.

But this design does not work. It seems the diaog is not completely created before it switch from the thread to the main program thread. So when I call UpdateProgressBar() from the main program thread, it will simply return with false. I tried to do things in reverse: do lenthy computation in the newly created thread and create the dialog box in the main program thread, and it works well. But to be consistent, I need to do it like what I am doing now. Can anyone help me in this problem? Thanks!

Here is my code:

---------------------------------------------------------
void CStatusApp::OnHelpStatisdlg()
{

     CWinThread* pMyThread = AfxBeginThread(MyControllingFunction, NULL, THREAD_PRIORITY_NORMAL);

     // Do some lenthy compuataion and updage the progress bar on the dialog
     for(int n=0; n<10; n++)
     {
          Sleep(100);

          // Update the progress bar
          m_cMyDialog.UpdateProgressBar();
     }
}

UINT CStatusApp::MyControllingFunction(LPVOID pParam)
{
     
     // Create Modal dialog window to indicate the progress of the computation
     ((CStatusApp*)AfxGetApp())->m_cMyDialog.DoModal();

     return 1;
}

// Update the progress bar on the dialog
bool CStatusDialog::UpdateProgressBar()
{
     if(!GetSafeHwnd())     return false;

     int i;
     i = m_cProgress.GetPos();
     i = i + 10;
     m_cProgress.SetPos(i);

     return true;
}