CPaintDC and Tab Control ?

   Could any one explain how this code segment could be correctly written.
It's a dialog-based program with a tab control. And for this example, two
bitmaps should be painted on Tab2 of three. And any variable not declared
locally is declared in the class declaration. Also, I need to paint them
directly onto the dialog form since there will be many small bitmaps (in the
thousands) row after row with 12 to 20 in a row.

void CTab2::OnPaint()
{
   CPaintDC dc(this);

   if(bUpdateBmp)
     {
        bmp.LoadBitmap(Crd);
        bmp.GetBitmap(&BmpInfo);
        dcMem.CreateCompatibleDC(&dc);
        pOldBmp = dcMem.SelectObject(&bmp);
        dc.BitBlt(Xpos, Ypos, BmpInfo.bmWidth,
                BmpInfo.bmHeight, &dcMem, 0, 0, SRCCOPY);
        dcMem.SelectObject(pOldBmp);
        dcMem.DeleteDC();
        bmp.DeleteObject();
     }
}

void CTab2::InitTab2() //This called from the main dialog class.
{
   int Demo[2];
   Demo[0] = IDB_BITMAP1;
   Demo[1] = IDB_BITMAP2;

   for(int i = 0; i < 2; ++i)
     {
        switch(Demo[i])
            {
               case 0 : Crd = IDB_BITMAP1;
               break;
               case 1 : Crd = IDB_BITMAP2;
               break;
            }

       switch(Demo[i])
          {
              case 0 : Xpos = 20;
              break;
              case 1 : Xpos = 60;
              break;
          }

      Ypos = 40;

       bUpdateBmp = true;
       Invalidate();
      UpdateWindow();
    }
}