### behaviorClass
This property lets you pass a class in for the behavior to use. This is nice to have when the behavior is a dependency of the view in requirejs. Properties passed in this way will be used in `getBehaviorClass`.

```js
define(['lib/tooltip'], function(Tooltip) {
  var View = Marionette.ItemView.extend({
     behaviors: {
        Tooltip: {
          behaviorClass: Tooltip
        }
     }
  });
});
```