"OR" condition is not supported by Nolics and cannot be used. We will support OR condition from 4.0 where we are going to use Open Access ORM.
There is not elegant way filter the items using the API and achieve similar behavior as "OR" condition. However below are some steps ( note that this will result in the performance of the control and your website - this way requires several foreach and if loops).
1. Create a custom class that derives from ContentView class.
2. Override CreateDataSource method used to retrieve content items from the data store.
3. Use intersection to apply "OR" filtering. You should create a two list of items - list1 and lit 2. Then for each item in list1 you should have two conditions - which checks whether the item ID exists or not in the fists list.
I hope this helps.
the Telerik team