docs: function(deferred, message, avoidDisplayError){
  				this._serviceRegistry.getService("orion.page.message").showWhile(deferred, message); //$NON-NLS-1$
  
  				var that = this;
  				// If the underlying deferred was rejected, display an error
  				deferred.then(null, function(error) {
  					if (avoidDisplayError) {
  						// do nothing
  					} else {
  						that.setProgressResult(error);
  					}
  				});
  				return this.progress(deferred, message);
  			}