docs: function(textModel) {
  			if (this._model) {
  				this._model.removeEventListener("Changed", this._listener.onChanged); //$NON-NLS-0$
  			}
  			this._model = textModel;
  			if (this._model) {
  				this._model.addEventListener("Changed", this._listener.onChanged); //$NON-NLS-0$
  			}
  		}