Maybe you can share a bit more info about your items e.g you say they are of different types . Do they share common properties ? Which properties you need to use while displaying them ? ( e.g. a string typed Description perhaps) . Do they inherit a common base type ( other than Object ;) ) or do they implement a common interface .
As most of the items controls on the market and their derivatives as well - Telerik components typically target homogenous data, meaning items in a lets say RadGridView may be different but at least share some properties from a common base type.
the Telerik team
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