Tooltips with setMemImage?

[pehrlich]

Is it possible to use tooltips when using setMemImage(true)?  We cannot use temp files to write the charts to disk, so we are using chart1.setMemImage(true), and using the SoftwareFX.ChartFX.servlet.ChartServlet.  When I do this, the charts work great but the tooltips do not work at all.  I looked at the examples and I am calling

chart1.setImgMap(ImgMap.TITLE_TIP);

But no tooltips appear.  If you view the source of the HTML page, no image map is generated.