Thank you for contacting us.
Unfortunately, filtering and virtualization are not supported by the RadComboBox
together. We will consider addressing this issue in one of our future releases.
Sorry if that causes you any inconvenience.
If you have any other questions about our controls let us know.
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