Facing issue while binding custom control with ComboBox

Hi There,
I have a requirement that I need to show custom control in combobox dropdown.

• I added items in combobox using following code.

  CustomControl instance = new CustomControl ();
  Combobox.Items.Add(CustomControl instance) ;

  Problem with above it, it does not render entire control but it does render full name of the control.

• I also tried to use Controls property of combobox.

  CustomControl instance = new CustomControl ();
  Combobox.Controls.Add(CustomControl instance);

Same issue happen. It haven’t render control but just a name of control.

My question is – Is there anyway, I can bind my custom control with combobox or is there any other type of control which allow to do this.