I am using related comboboxes as outlined in this article: http://demos.telerik.com/aspnet-ajax/combobox/examples/functionality/multiplecomboboxes/defaultcs.aspx - I have a series of comboboxes that helps narrow down addresses. My comboboxes in order are: Country - State - County - Zip - City. I can successfully pass a single value from one combobox to the next and the result set is narrowed down correctly. However, if I try to pass the selected values from state, county, and zip to narrow down the potential city selections, I get undefined values for state and county, but zip will pass correctly. When I perform a postback I can access all the selected values in the comboboxes. What am I missing?