title: How to format values within the data point tooltips in a RadChart?
body: <p>I want to format the display of numeric values in an ASP.NET RadChart's tooltips. For example, instead of showing 100000, I want the text to read "1.0e5". For the axes, the property to set is as follows:</p>
  
  <pre><code>chart.InnerChart.PlotArea.YAxis.Appearance.CustomFormat = "0.##E+0";
  </code></pre>
  
  <p>There must be a similar property on the chartSeries to similarly format the tooltips, but so far I have failed to locate it. Does anyone know?</p>