private void Button_Click(object sender, RoutedEventArgs e)
 {
     try
     {
         this.Cursor = Cursors.Wait;
         _viewModel.AddSeries();
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message, ex.StackTrace);
     }
     finally
     {
         this.Cursor = Cursors.Arrow;
     }
 }