code: function(property) {
          var parsedPath = View._parsePropertyPath(property);
          var path = parsedPath.path;
  
          var val = get(this, path);
          if (val === undefined && isGlobalPath(path)) {
            val = get(Ember.lookup, path);
          }
  
          return View._classStringForValue(path, val, parsedPath.className, parsedPath.falsyClassName);
        }
docs: Given a property name, returns a dasherized version of that
  property name if the property evaluates to a non-falsy value.
  
  For example, if the view has property `isUrgent` that evaluates to true,
  passing `isUrgent` to this method will return `"is-urgent"`.
  
  @method _classStringForProperty
  @param property
  @private