code: function() {
  
  		var old_active_argument_index = this._active_argument_index;
  		this._refreshActiveArgumentIndex();
  
  		if (this._active_argument_index != old_active_argument_index) {
  
  			if (this._active_template && this._is_inDOM) {
  
  				this._removeTemplate(this._active_template);
  
  			}
  
  			this.trySetDirty();
  			this._active_template = null;
  
  		}
  
  	}
docs: Listener for argument's {@link Lava.scope.Argument#event:changed} event