How to Remove the Current Selection in ComboDropDown Control

18 Nov 20181 minute to read

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

C#

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);
    }
}

VB.NET

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