[xwiki-users] Treeview in a panel

Hi guys, I found a code snippet on xwiki.org, that does a TreeNav feature, but actually, this is not what I want. I would like to have the Treeview, as on /XWiki/Treeview inside a panel. As a matter of fact, it seems the code for Treeview does only work, when there is nothing else on that page, so adding just a line of text in the beginning of the XWiki/Treeview page seems to make the "+"-signs to open the tree-structure unusable. Probably for the same reason, I did not manage yet, to get it inside a panel. Do you have some ideas, what I could do to get what I want? Thanx, Sebastian