code: function(id, fn, obj, overrideContext) {
                  this.onAvailable(id, fn, obj, overrideContext, true);
              }
docs: Works the same way as onAvailable, but additionally checks the
  state of sibling elements to determine if the content of the
  available element is safe to modify.
  
  <p>The callback is executed with a single parameter:
  the custom object parameter, if provided.</p>
  
  @method onContentReady
  
  @param {string}   id the id of the element to look for.
  @param {function} fn what to execute when the element is ready.
  @param {object}   obj an optional object to be passed back as
  a parameter to fn.
  @param {boolean|object}  overrideContext If set to true, fn will execute
  in the context of obj.  If an object, fn will
  exectute in the context of that object
  
  @static