title: Override Data Tip Circle
body: <p>In flex charting you can customize the box which displays datatip information, but is there any easy way of changing the little circle which is displayed next to the datatip box?</p>
  
  <p><a href="http://help.adobe.com/en_US/flex/using/images/chd_SimpleDataTip.png" rel="nofollow">http://help.adobe.com/en_US/flex/using/images/chd_SimpleDataTip.png</a></p>
  
  <p>I've found the method positionDataTips() in ChartBase which appears to do the drawing of the circle. I was going to subclass LineChart and override the method with my modified version of it. However, this method needs access to a lot of private instance variables which are only accessible to ChartBase.</p>
  
  <p>Thoughts?</p>