private void captureScopeValues() {
        String var = getVar();
        Map<String, Object> requestMap = getFacesContext().getExternalContext().getRequestMap();
        if (var != null) {
            _origValue = requestMap.get(var);
        }
        String varStatus = getVarStatus();
        if (varStatus != null) {
            _origVarStatus = requestMap.get(varStatus);
        }
    }
Handle case where this table is nested inside another table. See method getDataModel for more details.
<p>
Key: parentClientId (aka rowId when nested within a parent table) Value: DataModel
primefaces/src/main/java/org/primefaces/component/api/UITabPanel.java