After much pain and agony with RadPanelBar and user controls, I'm trying a different approach in using ItemTemplates for the Panel bar items with databinding to a custom object collection. Now I'm having problems collapsing the different items. I know that I cannot collapse root items and have tried to follow your examples on how structure my panel bar properly to allow for collapse/expand but I cannot find any documentation in regards to data-bound panel bars.. and I cannot spend anymore time on this one little part of my website.
Here's my markup, designed per http://www.telerik.com/help/aspnet-ajax/panelbar-troubleshooting-root-items-collapse.html:
Here's my databinding in code behind:
The root items are displaying my account names, as expected, but I cannot expand them to see the user control inside. I initially defined the markup without any nested items, with the user control defined as an ItemTemplate, and it rendered correclty but I couldn't collapse the items.