code: function (oEvent) {
  				// Update filter value
  				this._sFilter = oEvent.getParameter("newValue").trim();
  
  				if (this._filterTimeout) {
  					clearTimeout(this._filterTimeout);
  				}
  
  				this._filterTimeout = setTimeout(function () {
  
  					if (this.buildAndApplyFilters()) {
  						this._expandAllNodes();
  					} else {
  						this._collapseAllNodes();
  						if (this.oSelectedItem) {
  							this._expandTreeToNode(this.oSelectedItem.sTopicId, this.oSelectedItem.oModel);
  						}
  					}
  
  					this._filterTimeout = null;
  				}.bind(this), 250);
  
  			}
docs: Handler for the SearchField
  @param oEvent