Modal Box in Navigation array
I'd like to implement a modal box within the navigation array. I'm trying to use bootstrap's modal functionality, so I need the link to have an attribute like data-toggle='modal'. How can this be coded into the navigation array? I have a seen that a container_tag_attrs exists for the main container, this is pretty close to what I want except that it doesn't seem to be available for a specific item.
Thanks a lot in advance,