bootstrap, modal dialogs, shown.bs.modal event doesn't fire

I had the exact same Problem. I could fix it with the solution to this StackOverflow question: Bootstrap modal 'loaded' event on remote fragment

Basically you have to open the modal manually and implement the Ajax loading yourself. Something like:

$modal.modal({
    'show': true
}).load('/Banner/SlideEditModal/1/1', function (e) {
    // this is executed when the content has loaded.
});