Since, I suppose you have customized the approach to fit your scenario, looking at the sample project I can suggest you to add in the OnAutocompleteProviderChanged
property the following line:
That will add 20 items in the ComboBox.
Hope this helps.
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