If you want to add the user controls dynamically, then place a PlaceHolder control in the ItemTemplate of the RadListView. Then handle the ItemCreated event of the RadListView. There if the "e.Item" is RadListViewDataItem, find the PlaceHolder by its ID, e.g. using the FindControl method and load the user control in it.
For more information on accessing controls in RadListView, check this article
the Telerik team