private void cbChartType_SelectedIndexChanged(object sender, RoutedEventArgs e)
 {
     if (cbChartType.SelectedIndex < 0)
     {
         return;
     }
     chartControl.Diagram = ChartFactory.GenerateDiagram((Type)((ComboBoxEditItem)cbChartType.SelectedItem).Tag, ceShowPointsLabels.IsChecked);
     pivotGridControl.ChartProvideEmptyCells = IsProvideEmptyCells();
 }