.state-expanded:click {
    action-server: collapseSubTree;
    collapseSubTree-value: kssAttr("node");
    collapseSubTree-xvalue: kssAttr("xnode");
}

.state-collapsed:click {
    action-server: expandSubTree;
    expandSubTree-value: kssAttr("node");
    expandSubTree-xvalue: kssAttr("xnode");
}