Behaviors, like views, have a ui attribute that can reference and cache DOM
elements, just as in the View
The Behavior has a number of proxies attributes that directly refer to the
related attribute on a view: $, el, $el.
In addition, each behavior is able to reference the view they are attached to
through the view attribute
As in views, events and triggers can use the ui references in their
listeners. These can be defined on either the Behavior or the View