C#

public class CellInfo
{
   private Rectangle m_bounds;
   private Color m_clr;
   private int m_data;
 
   public Rectangle Bounds
   {
      get { return this.m_bounds; }
      set { this.m_bounds = value; }
   }
 
   public Color Color
   {
      get { return this.m_clr; }
      set { this.m_clr = value; }
   }
 
   public int Data
   {
      get { return this.m_data; }
      set { this.m_data = value; }
   }
}

public class CellInfoCollection : System.Collections.CollectionBase
{
   public CellInfo this[int index]
   {
      get { return (CellInfo)this.List[index]; }
      set { this.List[index] = value; }
   }
 
   public CellInfoCollection()
   {
   }
 
   public void Add(CellInfo info)
   {
      this.List.Add(info);
   }
}

[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]<br />
public CellInfoCollection Cells<br />
{<br />
   get { return this.m_cells; }<br />
}

ProgressBarEx /*or whatever he calls it*/ pbar = new ProgressBarEx();
pbar.Width = 200;
pbar.Height = 200;
pbar.Location = new Point(0, 0);
Controls.Add(pbar);

bool tabPage1Loaded = false;<br />
<br />
void OnSelectedIndexChanged(object s, EventArgs e)<br />
{<br />
if(tabControl.SelectedIndex == 1 && !tabPage1Loaded){<br />
// do something to initalize tab 1<br />
tabPage1Loaded = true;<br />
}<br />
}