code: function() {
  			if (this._model) {
  				this._model.removeEventListener("postChanged", this._listener.onChanged); //$NON-NLS-0$
  				this._model.removeEventListener("preChanging", this._listener.onChanging); //$NON-NLS-0$
  				this._model = null;
  			}
  		}
docs: Destroys this projection text model.