title: Zero label is not displayed in Telerik RadChart
body: <p>I'm using Telerik RadChart for drawing a line chart. Everything is OK except Zero value don't show up as attached.</p>
  
  <p><img src="https://i.stack.imgur.com/y0bRr.png" alt="enter image description here">
  <img src="https://i.stack.imgur.com/WNKYY.png" alt="enter image description here"></p>
  
  <p>Is there an appearance property that is responsible of this behavior?</p>
  
  <p>I'm creating the control like this:</p>
  
  <pre><code>    /// &lt;summary&gt;
      /// builds the chart object
      /// &lt;/summary&gt;
      /// &lt;param name="chartSeriesItems"&gt;Series Items For index values&lt;/param&gt;
      /// &lt;param name="chartAvrageSeriesItems"&gt;Avrage 2 seies items for start and end&lt;/param&gt;
      /// &lt;returns&gt;&lt;/returns&gt;
      private RadChart BuildChart(List&lt;ChartSeriesItem&gt; chartSeriesItems, List&lt;ChartSeriesItem&gt; chartAvrageSeriesItems)
      {
          RadChart chart = new RadChart();
  
          chart.ID = "SparklineChart";
          chart.Width = 200;
          chart.Height = 140;
          chart.DefaultType = ChartSeriesType.Line;
          chart.AutoLayout = true;
          chart.ChartTitle.Visible = false;
  
          chart.Appearance.Dimensions.Margins = ChartMargins.Parse("0px, 0px, 0px, 0px");
          chart.Appearance.Dimensions.Paddings = ChartPaddings.Parse("0px, 0px, 0px, 0px");
          chart.Appearance.Dimensions.AutoSize = true;
          chart.Appearance.Dimensions.Height = 140;
          chart.Appearance.Dimensions.Width = 200;
          chart.Appearance.FillStyle.FillType = FillType.Solid;
          chart.Appearance.FillStyle.MainColor = Color.Transparent;
          chart.Appearance.Border.Visible = false;
  
  
          chart.Legend.Visible = false;
  
          chart.PlotArea.XAxis.Visible = ChartAxisVisibility.False;
          chart.PlotArea.YAxis.Visible = ChartAxisVisibility.False;
          chart.PlotArea.Appearance.Dimensions.Margins = ChartMargins.Parse("0px, 0px, 0px, 0px");
          chart.PlotArea.Appearance.Dimensions.Paddings = ChartPaddings.Parse("0px, 0px, 0px, 0px");
          chart.PlotArea.Appearance.FillStyle.FillType = FillType.Solid;
          chart.PlotArea.Appearance.FillStyle.MainColor = Color.Transparent;
          chart.PlotArea.Appearance.Border.Visible = false;
          chart.PlotArea.EmptySeriesMessage.TextBlock.Appearance.AutoTextWrap = AutoTextWrap.True;
          chart.PlotArea.EmptySeriesMessage.TextBlock.Text = Resources.Text.NoData;
  
  
          //add series
          ChartSeries scoreSeries = new ChartSeries();
          scoreSeries.Name = "Score";
          scoreSeries.DefaultLabelValue = "#Y" + FormatText.GetFormat(Global.GetUserProfile().NumbersFormat, Global.GetUserProfile().DecimalDigits).Replace("0:", "");
          scoreSeries.Appearance.FillStyle.MainColor = Color.Black;
          scoreSeries.Appearance.LabelAppearance.Visible = true;
          scoreSeries.Type = ChartSeriesType.Line;
          scoreSeries.Items.AddRange(chartSeriesItems);
  
          ChartSeries avrageSeries = new ChartSeries();
          avrageSeries.Name = "Avrage";
          avrageSeries.DefaultLabelValue = "#Y" + FormatText.GetFormat(Global.GetUserProfile().NumbersFormat, Global.GetUserProfile().DecimalDigits).Replace("0:", "");
          avrageSeries.Appearance.FillStyle.MainColor = Color.Gray;
          avrageSeries.Appearance.LabelAppearance.Visible = true;
          avrageSeries.Type = ChartSeriesType.Line;
          avrageSeries.Appearance.LineSeriesAppearance.Width = 1;
          avrageSeries.Items.AddRange(chartAvrageSeriesItems);
  
  
  
          chart.Series.Add(scoreSeries);
          chart.Series.Add(avrageSeries);
  
          return chart;
      }
  </code></pre>
  
  <p>And I'm adding values like this:</p>
  
  <pre><code> ChartSeriesItem seriesItem = new ChartSeriesItem()
                              {
                                  Name = "1",
                                  XValue = index++,
                                  YValue = 200
                              };
                          totalYValue += 200;
                          seriesItem.Label.Appearance.FillStyle.MainColor = SAObjectsUtilities.GetColorFromStatus(SA_Globals.Status.Blue);
                          //seriesItem.Label.TextBlock.Appearance.TextProperties.Color = SAObjectsUtilities.GetLabelForeGroundColor(item.ScoreStatus);
                          seriesItem.Label.TextBlock.Appearance.TextProperties.Font = new Font(new FontFamily("Arial"), 7);
                          seriesItem.Label.TextBlock.Appearance.TextProperties.Color = Color.Black;
                          chartSeriesItems.Add(seriesItem);
  
  
  
  
                          ChartSeriesItem seriesItem2 = new ChartSeriesItem()
                          {
                              Name = "2",
                              XValue = index++,
                              YValue = 0
                          };
                          totalYValue += 0;
                          seriesItem2.Label.Appearance.FillStyle.MainColor = SAObjectsUtilities.GetColorFromStatus(SA_Globals.Status.Red);
                          //seriesItem.Label.TextBlock.Appearance.TextProperties.Color = SAObjectsUtilities.GetLabelForeGroundColor(item.ScoreStatus);
                          seriesItem2.Label.TextBlock.Appearance.TextProperties.Font = new Font(new FontFamily("Tahoma"), 7);
                          seriesItem2.Label.TextBlock.Appearance.TextProperties.Color = Color.Black;
                          chartSeriesItems.Add(seriesItem2);
  </code></pre>