How to Remove the Current Selection in ComboDropDown Control

We can derive custom ComboDropDown control and override DrawListModeEditPortion property to remove the selection as follows.

public class CustomComboDropDown : ComboDropDown
{
    public CustomComboDropDown()
    {
    }
    protected override void DrawListModeEditPortion(PaintEventArgs e, Color highlightBG, Color highlightText, bool drawFocusRect)
    {
// Set the highlightBG to Color.Transparent to draw transparent selection.

// Set drawFocusRect to false to hide the focus rectangle.
        base.DrawListModeEditPortion(e, Color.Transparent, highlightText, false);
    }
}
Public Class CustomComboDropDown : Inherits ComboDropDown
Public Sub New()
End Sub
Protected Overrides Sub DrawListModeEditPortion(ByVal e As PaintEventArgs, ByVal highlightBG As Color, ByVal highlightText As Color, ByVal drawFocusRect As Boolean)

' Set the highlightBG to Color.Transparent to draw transparent selection.

' Set drawFocusRect to false to hide the focus rectangle.
MyBase.DrawListModeEditPortion(e, Color.Transparent, highlightText, False)
End Sub
End Class