ComponentArt dll - how do i add reference for controls?

I have a ComponentArt DLL licence version 2011 (a little old) running version asp.net 3.5

I am trying to use the Scheduler Contol by using this reference in my nopcommerce 1.9 project however when i try to use the datasource property it is not recognised with the following error:

NopSolutions.Nopcommerce.Web.Scheduler does not contain a definition for 'DataSource' and no extension method 'Datasource' accepting a first argument of type NopSolutions.Nopcommerce.Web.Scheduler could be found (are you missing a using directive or an assebly reference?)

How do i simply add a new DLL reference and use it within the nopcommerce project???