Hi Srividya,
Thanks for the reply. I'm using the library 1.4.1 (fusionchartstaglibJSF1-2-java5-Version1_4_1.jar). The problem was solved after I changed two things:
1) I use now fc:render instead of fc:renderHTML (don't know what the difference is, but got the original idea from the sample application you posted)
2) Now I'm passing the xml back from my backing bean without problems and yesterday I was directly writing it on the xhtml page, the difference is that the xml from my backing bean comes correctly escaped (no "<" or ">" in the xml string, but "<" and ">" instead), by the way, I even tried using "!
Apart from that, the library works for our purposes, not it's time to lear how to take advange of all the available charts
Thanks,
Javi