Hello Michael Landy,
I suggest you subscribe to OnClientLoad event of the listbox and calculate the height in its handler:
also you should add the following css styles to your page:
Best regards,
Yana
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?
Explore the
Telerik Public Issue Tracking
system and vote to affect the priority of the items.