Result module "Not allowing to select more than one quiz at the time"

Hello,

Yes result modules do not allow you to choose multiple Quizzes. If you do not choose any Quiz it means the result would be displayed from all of the Quizzes.

I need to select multiple quizzes for the results page.
When I go to select quizzes it allows me to select only one.
It happens on both modules vQuiz Results and vQuiz Myresults
I've attached the screen shot of what I see in the back end.
I think there might be a missing button on the selector or something.

Any Ideas?

Thank you