[CLOSED] Select node after expand in TreePanel

[multimediait]

Good evening, I'm trying select a TreePanel's leaf after expand node (load ondemand) with this function:

var SelectNode = function (path, serial) {
    var tree = Ext.getCmp("treeArchivi"),
          sm = tree.getSelectionModel(),
          node = tree.store.getNodeById(serial);

    if (node == undefined) {
        tree.expandPath(path);
    }

    node = tree.store.getNodeById(serial);
    console.log(node);
    if (node != undefined) {
        sm.select(node);
        App.direct.OpenArchivio(formatSerial(serial), node.data.text);
    }
};

but console.log(node); returns undefined.
How can I resolve this issue?

Thanks in advance