I have a RadComboBox that is populated on demand with a web service with items based off what the user types. It works fine with a basic string as the text value when I add a RadComboBoxItemData object to the array that I pass back with the web service. I would like to have a template format when the RadComboBox is opened though. For example, a name with a formatted address that is a different color than the title and someone dynamically formatted based on what fields exist for each record. I didn't see an example, so I tried to generate a few HTML tags to handle that. It displays fine when expanded, although it has the tags for the textbox area. It would be nice if I could just have the name in the textbox, but the name and formatted address when the RadComboBox is open. When I select one of the items I get a server 500 error. In the event viewer, it states that "A potentially dangerous Request.Form value was detected from the client ". Is there some other way that I should be doing this? Is the functionality I am looking for even possible right now with the RadComboBox?