Problemas com o Data Table ( Master-Detail do MyFaces )

Tudo funciona legalzinho, menos a parte mais importante que é o link Show

<%@ page session=“false” contentType=“text/html;charset=utf-8”%>
<%@ taglib uri=“http://java.sun.com/jsf/html” prefix=“h”%>
<%@ taglib uri=“http://java.sun.com/jsf/core” prefix=“f”%>
<%@ taglib uri=“http://myfaces.apache.org/tomahawk” prefix=“t”%>

<body>
	<f:view>
	     <h:form>
			<h:panelGroup id="body">

				<h:panelGrid columns="1">
					<h:commandLink action="go_country" immediate="true">
						<h:outputText value="Adiciona novo Pais" styleClass="standard" />
					</h:commandLink>
					<h:commandLink action="go_edit_table" immediate="true">
						<h:outputText value="Edita Pais" styleClass="standard" />
					</h:commandLink>
				</h:panelGrid>
				<f:verbatim>
					<br>
				</f:verbatim>

				<t:dataTable id="data" 
				styleClass="standardTable" 
				headerClass="standardTable_Header" 
				footerClass="standardTable_Header" 
				rowClasses="standardTable_Row1,standardTable_Row2"
				columnClasses="standardTable_Column,standardTable_ColumnCentered,standardTable_Column" 
				var="currentCountry" 
				value="#{countryList.countries}" 
				preserveDataModel="true" 
				varDetailToggler="detailToggler">
					<h:column>
						<f:facet name="header">
							<h:outputText value="Pais" />
						</f:facet>
						<t:commandLink action="go_country" immediate="true">
							<h:outputText value="#{currentCountry.name}" />
						    <t:updateActionListener property="#{countryForm.id}" value="#{currentCountry.id}" />
						</t:commandLink>
					</h:column>

					<h:column>
						<f:facet name="header">
							<h:outputText value="UF" />
						</f:facet>
						<h:outputText value="#{currentCountry.isoCode}" />
					</h:column>

					<h:column>
						<f:facet name="header">
							<h:outputText value="Cidades" />
						</f:facet>

<h:commandLink rendered="#{detailToggler.currentDetailExpanded}" action="#{detailToggler.toggleDetail}">

<h:outputText value=“Hide” />

</h:commandLink>

<h:commandLink rendered="#{!detailToggler.currentDetailExpanded}" action="#{detailToggler.toggleDetail}">

<h:outputText value=“Show” />

</h:commandLink>

</h:column>

<f:facet name=“detailStamp”>

<t:dataTable id=“cities”

styleClass=“standardTable_Column” var=“city”

value="#{currentCountry.cities}">

<h:column>

<h:outputText value="#{city}" style=“font-size: 11px” />

</h:column>

<h:column>

<h:selectBooleanCheckbox value="#{city.selected}"></h:selectBooleanCheckbox>

</h:column>

<h:column>

<h:commandLink action="#{city.unselect}" value=“Unselect”/>

</h:column>

</t:dataTable>

</f:facet>

</t:dataTable>

<f:verbatim>
					<br>
				</f:verbatim>
			</h:panelGroup>				
		</h:form>
    </f:view>
</body>

Quando pressiono o link Show acontece o seguinte erro:

java.lang.ClassCastException: javax.faces.model.ListDataModel

org.apache.myfaces.component.html.ext.HtmlDataTable.updateModelFromPreservedDataModel(HtmlDataTable.java:401)

org.apache.myfaces.component.html.ext.HtmlDataTable.processUpdates(HtmlDataTable.java:387)

javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:935)

javax.faces.component.UIForm.processUpdates(UIForm.java:196)

javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:935)

javax.faces.component.UIViewRoot.processUpdates(UIViewRoot.java:363)

Codigo da Classe

package conferencia;

import org.apache.myfaces.component.html.ext.HtmlDataTable;

import javax.faces.event.ActionEvent;

import javax.faces.component.UIComponent;

import javax.faces.component.UIData;

import java.math.BigDecimal;

import java.util.ArrayList;

import java.util.List;

import java.util.Map;

import java.util.HashMap;

/**

DOCUMENT ME!
@author Thomas Spiegl (latest modification by $Author: grantsmith $)

@version $Revision: 472610 $ $Date: 2006-11-08 20:46:34 +0100 (Wed, 08 Nov 2006) $

*/

public class SimpleCountryList

{

private List _countries = new ArrayList();

static

{

}

SimpleCountry getSimpleCountry(long id)

{

for (int i = 0; i < _countries.size(); i++)

{

SimpleCountry country = (SimpleCountry)_countries.get(i);

if (country.getId() == id)

{

return country;

}

}

return null;

}

long getNewSimpleCountryId()

{

long maxId = 0;

for (int i = 0; i < _countries.size(); i++)

{

SimpleCountry country = (SimpleCountry)_countries.get(i);

if (country.getId() > maxId)

{

maxId = country.getId();

}

}

return maxId + 1;

}

void saveSimpleCountry(SimpleCountry simpleCountry)

{

if (simpleCountry.getId() == 0)

{

simpleCountry.setId(getNewSimpleCountryId());

}

boolean found = false;

for (int i = 0; i < _countries.size(); i++)

{

SimpleCountry country = (SimpleCountry)_countries.get(i);

if (country.getId() == simpleCountry.getId())

{

_countries.set(i, simpleCountry);

found = true;

}

}

if (!found)

{

_countries.add(simpleCountry);

}

}

void deleteSimpleCountry(SimpleCountry simpleCountry)

{

for (int i = 0; i < _countries.size(); i++)

{

SimpleCountry country = (SimpleCountry)_countries.get(i);

if (country.getId() == simpleCountry.getId())

{

_countries.remove(i);

}

}

}

public SimpleCountryList()

{

_countries.add(new SimpleCountry(1, “AUSTRIA”, “AT”, new BigDecimal(123L), createCities(new String[]{“Wien”,“Graz”,“Linz”,“Salzburg”})));

_countries.add(new SimpleCountry(2, “AZERBAIJAN”, “AZ”, new BigDecimal(535L), createCities(new String[]{“Baku”,“Sumgait”,“Qabala”,“Agdam”})));

_countries.add(new SimpleCountry(3, “BAHAMAS”, “BS”, new BigDecimal(1345623L), createCities(new String[]{“Nassau”,“Alice Town”,“Church Grove”,“West End”})));

_countries.add(new SimpleCountry(4, “BAHRAIN”, “BH”, new BigDecimal(346L), createCities(new String[]{“Bahrain”})));

_countries.add(new SimpleCountry(5, “BANGLADESH”, “BD”, new BigDecimal(456L), createCities(new String[]{“Chittagong”,“Chandpur”,“Bogra”,“Feni”})));

_countries.add(new SimpleCountry(6, “BARBADOS”, “BB”, new BigDecimal(45645L), createCities(new String[]{“Grantley Adams”})));

}

/**

@param names
@return
*/
private SimpleCity[] createCities(String[] names)
{
SimpleCity[] result = new SimpleCity[names.length];
for (int i = 0; i < result.length; i++)
{
result[i] = new SimpleCity(names[i]);
}
return result;
}

public List getCountries()

{

return _countries;

}

public Map getCountryMap()

{

Map map = new HashMap();

List li = getCountries();

 for (int i = 0; i < li.size(); i++)
 {
     SimpleCountry simpleCountry = (SimpleCountry) li.get(i);
     map.put(simpleCountry.getIsoCode(),simpleCountry.getName());
 }

 return map;

}

public void setCountries(List countries)

{

_countries = countries;

}

public String addCountry()

{

List list = getCountries();

list.add(new SimpleCountry(list.size() + 1, “”, “”, new BigDecimal(0), createCities(new String[] {})));

return “ok”;

}

public void deleteCountry(ActionEvent ev)

{

UIData datatable = findParentHtmlDataTable(ev.getComponent());

getCountries().remove(datatable.getRowIndex() + datatable.getFirst());

}

/**

@param component
@return
*/
private HtmlDataTable findParentHtmlDataTable(UIComponent component)
{
if (component == null)
{
return null;
}
if (component instanceof HtmlDataTable)
{
return (HtmlDataTable) component;
}
return findParentHtmlDataTable(component.getParent());
}
}

Sera que alguem consegue me ajudar?

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