C#

class Base
{
  [Display(Order = 0)]
  public int FirstProp {get;set;}

  [Display(Order = 1)]
  publuc string SecondProp {get; set;}
}

class Derived : Base
{
  [Display(Order = 2)]
  public string ThridProp {get;set;}
}

m_panels[nCount] = new Panel();
panel1.Controls.Add(m_panels[nCount]);

m_panels[nCount].BackColor = Color.Red;
m_panels[nCount].Location = e.Location; // doing this on mouse click event
m_panels[nCount].Size = new System.Drawing.Size(12, 12);
m_panels[nCount].Visible = true;

for (int i = 0; i < m_panels.Length; i++)
{
  if (m_panels[i] != null)
  {
     panel1.Controls.Remove(m_panels[i]);
     m_panels[i].Dispose();
  }
}