private void Chart_OnDataClick(object sender, ChartPoint chartpoint)
        {
            var chart = (LiveCharts.Wpf.PieChart)chartpoint.ChartView;

            filterModel.HoverTyp = null;
            filterModel.Packets  = filterModel.FilterOnStatistik();
            //clear selected slice.
            foreach (PieSeries series in chart.Series)
            {
                series.PushOut    = 0;
                series.DataLabels = true;
            }

            var selectedSeries = (PieSeries)chartpoint.SeriesView;

            selectedSeries.DataLabels = true;
            var typ = selectedSeries.Title;

            filterModel.HoverTyp = typ;
            filterModel.Packets  = filterModel.FilterOnStatistik();
        }