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Automatic load on demand issue

I've looked at the sample code over here as well as the videos describing how to use the WebHierarchalDataGrid but I'm still not sure how to proceed. 

I'd like to use ObjectDataSources (instead of going directly to SQL) but the examples seem to always show retrieving ALL of the "suppliers" and "products". I'd like to call a method like GetProducts and pass in the selected supplier id. Is there a way I can tie that together (an event perhaps?)? Can I do this without posting back? 

Thank you for your help.