The DNN docs provide some information about the CSS classes available to the DNN treeview.  However, if you look at the intellisense, you see a LOT more.  The problem is that they don't all seem to work.  Are they not all used?  There seems to be a lot of redundancy.  Here is what I'd like to do.  If you look at the source that is written to the page, you get something like this:

<div id="dnn_dnnTreeView_ctldnnTreeViewctr36">

<img width="0" src="/DNN/images/spacer.gif" style="width: 0pt; height: 1px;">

<img id="dnn_dnnTreeView_ctldnnTreeViewexpcol36" src="/DNN/Admin/Skins/spacer.gif" style="cursor: pointer;">

<span id="dnn_dnnTreeView_ctldnnTreeViewicnc36" class="">

<img id="dnn_dnnTreeView_ctldnnTreeViewicn36" src="/DNN/Admin/Skins/spacer.gif">

</span>

<span id="dnn_dnnTreeView_ctldnnTreeViewt36" style="cursor: pointer;" class="Tree_NodeChild Tree_NodeSelectedRoot">

About Us

</span>

</div>

What I'd like to be able to do is set a css class for the div itself, but I can't seem to find a property that corresponds to it.  Does one exist?