provided link to live demo article
provided link to live demo article

the article demonstrates the easiest possible working code that uses backbone, botstrap and backbone.bootstrap-modal. I think that the current docs were missing an example code - and here it is.
powmedia/backbone.bootstrap-modal,squidsolutions/backbone.bootstrap-modal,tindustry/backbone.bootstrap-modal,Mediamorph/backbone.bootstrap-modal,lassecph/backbone.bootstrap-modal,tindustry/backbone.bootstrap-modal