MFC Dialog controls goes invisible while running

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MFC

VisualC++

hi
I created a MFC application.Sometimes the controls(Button,Label etc) in the Dialog goes invisible at run time.The Dialog form remains.This is a random issue.The screenshots of the dialog in normal time and when goes blank are attached.Can anyone help me to find the solution for this ?

Click Here For the Normal Runtime Dialog

Click Here For the Blanked Runtime Dialog


for displaying/hiding the Dialog i used the following code

void CVideoConverter::PopUpDlg(BOOL bValue)
 {

try
{
    if(bValue) // show
    {

        CVideoConverterApp::m_pCVideoConverterDlg->ShowWindow(SW_SHOWNORMAL);
        CVideoConverterApp::m_pCVideoConverterDlg->UpdateWindow();

    }
    else
    {// hide

        CVideoConverterApp::m_pCVideoConverterDlg->ShowWindow(SW_MINIMIZE);
    }
}
catch(...)
{}
}

The following code was used to position the dialog to bottom right corner of the window.This is called before the PopupDlg()

void CVideoConverter::SetWindowToBottomRightCorner()
 {
   try
   {
      CRect rcScreen;
      SystemParametersInfo(SPI_GETWORKAREA, 0, (void *) &rcScreen, 0);
      CRect rcWindow;
      GetWindowRect(&rcWindow);
      MoveWindow(rcScreen.right - rcWindow.Width(), rcScreen.bottom - rcWindow.Height(),     rcWindow.Width(), rcWindow.Height(), TRUE);

  }

   catch(...)
  {}
}

Thanks

jayesh