Andwho.Windows.Forms.QQTabControl.OnMouseDown C# (CSharp) Метод

        protected override void OnMouseDown(MouseEventArgs e)
        {
            base.OnMouseDown(e);
            if (!this.DesignMode)
            {
                if (e.Button == MouseButtons.Left && this._btnArrowRect.Contains(e.Location))
                {
                    this._isFocus = true;
                    base.Invalidate(this._btnArrowRect);
                }
            }
        }