protected override void OnMouseMove(MouseEventArgs e)
        {
            //  if (_toolTip.Active)
            //    _toolTip.Hide(this);

            SuspendLayout();

            //如果处于框选状态,不处理Hover
            if (_layoutManager.MouseSelecting == false)
            {
                Hover(e.Location);
            }

            _layoutManager.MouseMove(e);

            ResumeLayout();

            base.OnMouseMove(e);
        }