mbert,
I have successfully worked with DTC's using several different techniques.
EASIEST
* First you may find that the DTC properties may provide you with the control you desire, look closely before adopting a different approach.
NEXT EASIEST
* You can sometimes successfully manipulate the resulting HTML output with client side script.
DIFFICULT
* You can alter the server script code for the DTC located in the _ScriptLibrary folder.
Hope this helps
-pete