How do I create a check-box matrix question using Acrobat XI Pro?

I would like to insert a question that is a 10 x 10 matrix that allows respondents to select multiple boxes in each row.  For example, the "add item > rating scale" feature formats a matrix the way I would like, although it only seems to allow for radio buttons.  With this feature, respondents can only select one item per row.  Is there any way to use this feature with check-boxes rather than radio buttons?  Or a different feature to create a matrix that allows for multiple selections per row? 

Thanks so much,

Andy