In a post I found -- I used the below code to hide the expalnd and collapse image on the panel bar.
div.RadPanelBar .rpExpandable .rpText,
div.RadPanelBar .rpExpanded .rpText
Which worked great, until I upgraded to the latest 2010 Q2 dll. I was using the 2009 Q3 dll.
It would be great if there was a property for this -- although I don't see anything like that. Any ideas?