title: Combobox DropDownList Style with white background
body: <p>I want to have an uneditable ComboBox but still show a white background colour, so it is effectively styled like the default ComboBox style (DropDown). The  ComboBoxStyle.DropDownList only provides the standard "disabled" looking grey back colour. Simply setting BackColor = Color.White has no effect.</p>
  
  <p>DropDownList: <a href="https://i.stack.imgur.com/4D4hv.png" rel="noreferrer"><img src="https://i.stack.imgur.com/4D4hv.png" alt="DropDownList"></a></p>
  
  <p>DropDown: <a href="https://i.stack.imgur.com/7uQS1.png" rel="noreferrer"><img src="https://i.stack.imgur.com/7uQS1.png" alt="DropDown"></a></p>