code: function (sId) {
  				var oItems = this.byId("tree").getItems();
  
  				for (var i = 0; i < oItems.length; i++) {
  					if (oItems[i].getTarget() === sId) {
  						return oItems[i];
  					}
  				}
  				return null;
  			}
docs: Scans the items aggregation of a sap.m.Tree for an item that has custom data with key="topicId" and value=sId
  Note: It's important to always fetch the items before searching as they change dynamically when nodes expand/collapse
  @param {string} sId
  @returns {null}
  @private