Thanks for writing and for your question.
You do not need to get the items from the DataBoundListBox itself to update the image in their template. What you need to do is update the URL on your business object and make sure you implement INotifyPropertyChanged correctly. This is a standard Silverlight/XAML pattern.
I hope this helps.
the Telerik team
Have a suggestion or face a problem - you can use the Ideas & Feedback portal
to submit ideas, feedback and vote for them.