wpf - update datasource after adding table to entity framework?

I'm learning WPF and EF so I may not use the correct terminology.  Using the EF wizard, I used two tables already in a SQL database.  Then I created a datasource and used that for control binding.

I successfully added another table to the EF diagram but am not able to update the datasource to reflect the new table.

Diagram after adding table (circled table was added):

Datasource after EF regeneration.  I expected to see the new table added here:

How do I update the datasource?

Thanks.