code: function(modelName)
  	{
  		modelName = modelName || '*';
  		if(this._bindingIndex !== null && this.scope.hasOwnProperty(modelName)) return this._bindingIndex;
  		if(this.parentView instanceof View) return this.parentView.getBindingIndex(modelName);
  		return null;
  	}
docs: Returns index of item in bound collection (closest collection in the view scope)
  
  @return {number} Item index