parentsChildrenId = "parents_children_" + elementID;
    protected void updateVarNames() {        String elementID = context().elementID();        elementID = ERXStringUtilities.replaceStringByStringInString(".", "_", elementID);        parentSelectName = "parent_" + elementID;        childSelectName = "child_" + elementID;        selectedParentId = "selected_parent_" + elementID;        selectedChildId = "selected_child_" + elementID;    }