Button Sets - prevent user going to next slide until all questions

Hi All

I have 6 questions on a slide with a Yes / No Answer (Button set).  The user must answer each question by selecting either Yes or No.  They can not go to the next slide until this is true.

I know how to prevent the user moving to the next slide for hotsports, buttons etc. but I can not find out if this is possible with button sets. 

Any help would be appreciated.

Cheers. Tee

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