code: function(region) {
      if (this._isShown) {
        throw new Error('This component is already shown in a region.');
      }
  
      if (!region) {
        throw new Error('Please supply a region to show inside.');
      }
  
      this.region = region;
  
      this.triggerMethod('before:show');
  
      this._showView();
      this._isShown = true;
  
      this.triggerMethod('show');
    }
docs: Show this component inside a region