Help with preview panel please.

["Neuman, Ben J., A&M IRM" <bj...@hq.afis.osd.mil>]

Hi,
Very new to FOP so please be patient.
I am trying to use the PreviewPanel in my Swing application to display an FO
document. I see in the javadocs that I need to do this:
 
    renderer.clearViewportList();
    // build report xml here
    fopPanel.reload(); 
 
The problem is that I do not understand exactly how to "//build report xml
here". I have the fo document allready. But how do I render it now in the
preview panel?
 
Thanks
Ben