title: Cannot extrapolate TeeChart Trend Function
body: <p>I'm using teechart with delphi to plot a series and the trend line for that series using the following code:</p>
  
  <pre><code>TF:= TTrendFunction.Create(self);
  TrendSeries.SetFunction(TF);
  TrendSeries.DataSource := OrigSeries;
  TrendSeries.CheckDataSource;
  </code></pre>
  
  <p>It works fine, but I was wondering if it's possible to have the trend line extrapolate forwards or backwards? I can't seem to find a way to retrieve x and y values of the series after it applies the function to extrapolate. I tried using the CalculateTrend function to calculate the 'm' and 'b' in y = mx + b, but it gave an access violation for that, same as when I try to access the series.YValue[i]. </p>
  
  <p>So is there even a way to retrieve those points it plots after applying the trend function?</p>
  
  <p>Thanks.</p>