private void panelTitle_MouseEnter(object sender, EventArgs e)
        {
            PanelHover = true;

            CancelHide();
            if (_button == null)
            {
                return;
            }

            if (_delayedActionPreview.Active)
            {
                _delayedActionPreview.Cancel();
            }

            _delayedActionPreview.Init(delegate() { ShowLivePreview(_button, true); }, WindowsConstants.TaskbarLivePreviewDelay);

            OnCustomEnter(sender, TooltipEventArgs.From(_button));
        }