How to set the GroupView control with no items selected when the button view is set to true?

When ButtonView is set to true, the user cannot set the selected index to -1 to make it as not selected. As an alternative, set the Button View to false as a default and in the GroupView’s MouseDown event or GroupViewItemSelected event, set the Button View to true.

// Set Button View in the MouseDown event.

private void groupView1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) 

{ 

this.groupView1.ButtonView = true; 

}
' Set Button View in the MouseDown event. 

Private Sub groupView1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs)

Me.groupView1.ButtonView = True

End Sub