function OnClientNodeClicking_HasChildren(sender, eventArgs) {
    var node = eventArgs.get_node();
    if (node.get_nodes().get_count() > 0) {
        node.toggle();
        eventArgs.set_cancel(true);
    }
    else if (node.get_value() == "RECORDSCOUNT" || node.get_value() == "ROOT") {
        eventArgs.set_cancel(true);
    }
}