Any example on binding Silverlight Combobox with both text and image from database

Question

I am working with Northwind and using WCF RIA (with EF 4.0) to pull data on to Silverlight client. All I am trying to accomplish is to have ComboBox showing list of Categories with both CategoryName and Picture from database. I am using ValueConverter to convert bytes to bitmapimage, but getting Catastrophic error.

Anyone has any ComboBox example which binds to Categories/Employees table of Northwind (along with pictures) using WCF RIA.

thanks