Drop-down height can be set by the property "Height". If you would like to show count of loaded items, you can use the event OnItemsRequested
. You can find such example in our online demos
, or in a sample project in the attachment.
We hope that this solution will meet your expectation.
Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.