Thank you for contacting us.
How do you add the listboxes to the pageview? Dynamically added controls should be added on every postback. If this is not the case, please open a support ticket and send us a simple page illustrating the issue there. Thanks in advance
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items.