Tagnode module: Individual theming for taggees

Hello everybody,
I am new to Drupal, so excuse if my questions sound a bit stupid.
I have a problem with the tagnode module. I don't know how to
alter a taggees display function. I uploaded a phpTemplate called
node-flexinode-3.tpl.php which works fine. With the help of the
function $node-> tagnode_append I could show the html of the
taggees, but this html only contained a link with the title. I have
several more fields like images, text areas and so on in this content type.
How can I show these additional contents in the html code of the taggee?

Thanks a lot
Martin