Hi Geoff, I have not tested my answer but...... we are too using TeeChart for Applet purpose and trigging JS from within the applet and from JS back to the Applet. There is a known issues about liveconnect and calling functions in an Applet. The call is not having the same access rights as when call...

You must have imported MarkStyles import com.steema.teechart.styles.* now the MarkStyles class is visible. Thanks Narcis, Sorry I wasn't more specific. As with the other problems I am encountering I am trying to do this via JavaScript in a webpage. Using: tChart.getSeries(0).getMarks().setStyle(Mark...