mixin for widget

attachpoint.js

function attachpoint(selector){
  return function(){
    return this.$(selector);
  }
}

// eg:
declare(WidgetBase, {
  $: function(selector){
    return query(selector, this.domNode);
  },
  myThing: attachpoint("ul.thinger"),
  postCreate: function(){
    console.log(this.myThing()); 
  }
})

var MyView = View.extend({
  myThing: attachpoint("ul.thinger"),
  clicker: function(e){
    this.myThing().append("<li>Hi</li>");
  }
})