System.Windows.Forms.CommandBar.OnMouseDown C# (CSharp) Method

        protected override void OnMouseDown(MouseEventArgs e)
        {
            if (this.Style == CommandBarStyle.Menu)
            {
                if ((e.Button == MouseButtons.Left) && (e.Clicks == 1))
                {
                    Point point = new Point(e.X, e.Y);
                    int index = this.HitTest(point);
                    if (this.IsValid(index))
                    {
                        this.TrackDropDown(index);
                        return;
                    }
                }
            }

            base.OnMouseDown(e);
        }