code: function (oEvent) {
  				var fnHandleAppsOverlay = function () {
  					var $CalendarRowAppsOverlay = jQuery(".sapUiCalendarRowAppsOverlay");
  
  					setTimeout(function () {
  						$CalendarRowAppsOverlay.addClass("sapUiCalendarRowAppsOverlayDragging");
  					}, 0);
  
  					jQuery(document).one("dragend", function () {
  						$CalendarRowAppsOverlay.removeClass("sapUiCalendarRowAppsOverlayDragging");
  					});
  				};
  				if (oTargetTimeline._isOneMonthIntervalOnSmallSizes() || !oTargetTimeline._isDraggingPerformed()) {
  					oEvent.preventDefault();
  					return;
  				}
  
  				fnHandleAppsOverlay();
  			}
docs: Fired when the user starts dragging an appointment.