code: function _allOverlaysCallback(event, nameOfFunctionCall, stopImmediatePropagationWhenHandled) {
                  var elements = _Global.document.querySelectorAll("." + _Constants.overlayClass);
                  if (elements) {
                      var len = elements.length;
                      for (var i = 0; i < len; i++) {
                          var element = elements[i];
                          var overlay = element.winControl;
                          if (!overlay._disposed) {
                              if (overlay) {
                                  var handled = overlay[nameOfFunctionCall](event);
                                  if (stopImmediatePropagationWhenHandled && handled) {
                                      // The caller has indicated we should exit as soon as the event is handled.
                                      return handled;
                                  }
                              }
                          }
                      }
                  }
              }
docs: Helper for Global Event listeners. Invokes the specified callback member function on each _Overlay in the DOM.