private Receiver<KongaTreeFilter> interceptor;
public TreeFilterField(KongaTree tree, Function<String, KongaTreeFilter> filterFunction) {
this.tree = tree;
this.filterFunction = filterFunction;
field = new KongaTextField();
field.setSelectAllWhenFocused(true);
closeAction = createCloseAction();
removeFilterOnClose = true;
label = "Filter:";
installTransferActions();