Sco object within a bespoke course

I have a development that is a bespoke course built in Storyline, however the 2nd section is a sco object from a 3rd party(This object is a interactive course)

The sco object is contained in 1 screen.

Problem

I can't get control back after the object has finished playing so am 'stuck' in the course.  I have tried opening in a new window but cannot give instructions at the end of the 'playing' top say 'close window'.... and to add confusion there is an inactive 'end course' button at the end of the sco object.

Can you advise on triggers etc that I can use to gain control back to the main bespoke course

Hope this makes sense.....