When ButtonView is set to true, user cannot set the selected index to -1 to make it as not selected. As a alternative, set the buttonview to false as a default and in GroupView's MouseDown event or event set buttonview to true.
Here is the code snippet:
private void groupView1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
this.groupView1.ButtonView = true;
Private Sub groupView1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs)
Me.groupView1.ButtonView = True
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