code: function deregisterInteractionHandler(fnHandler) {
  			var i,
  				oParentDOM = this.$parent.get(0),
  				oBlockLayerDOM = this.$blockLayer.get(0);
  
  			if (oParentDOM) {
  				for (i = 0; i < aPreventedEvents.length; i++) {
  				// Remove event listeners with "useCapture" settings
  					oParentDOM.removeEventListener(aPreventedEvents[i], fnHandler, {
  						capture: true,
  						passive: false
  					});
  				}
  			}
  			if (this._aSuppressHandler) {
  				for (i = 0; i < this._aSuppressHandler.length; i++) {
  					// this part should be done even no DOMRef exists
  					EventTriggerHook.release(this._aSuppressHandler[i]);
  				}
  			}
  			if (oBlockLayerDOM) {
  				this.$blockLayer.unbind('keydown', fnHandler);
  			}
  		}
docs: Deregister event handler to suppress event within busy section