Dados se perdem depois do filterBy da dataTable no primefaces2

Boa noite,

Estou fazendo o exemplo do showcase do prime. Esta funcionando quase tudo, o problema é:
Após preencher o textArea do filterBy e clicar no botão para editar, não vem nada. O selectedCar esta como null.

Ja faz alguns dias que estou enrolado nisso, alguém poderia me ajudar

teste.xhtm

<p:dataTable id="cars" var="car" value="#{tableBean.carsSmall}" rowKey="#{car.model}" tableStyle="width:auto" >

			<p:column headerText="Model" sortBy="#{car.model}" filterBy="#{car.model}" style="width:100px">
				<h:outputText value="#{car.model}" />
			</p:column>

			<p:column headerText="Year" sortBy="#{car.year}" filterBy="#{car.year}" style="width:100px">
				<h:outputText value="#{car.year}" />
			</p:column>

			<p:column headerText="Manufacturer" sortBy="#{car.manufacturer}" filterBy="#{car.manufacturer}" style="width:100px">
				<h:outputText value="#{car.manufacturer}" />
			</p:column>

			<p:column headerText="Color" sortBy="#{car.color}" filterBy="#{car.color}" style="width:100px">
				<h:outputText value="#{car.color}" />
			</p:column>

			<p:column style="width:40px">
				<p:commandButton id="selectButton" update=":form:display" oncomplete="carDialog.show()" image="ui-icon-pencil" title="View">
					<f:setPropertyActionListener value="#{car}" target="#{tableBean.selectedCar}" />
				</p:commandButton>
			</p:column>

		</p:dataTable>

TableBean.java

@ManagedBean
@SessionScoped
public class TableBean {

	private final static String[] colors;
	private final static String[] manufacturers;
	private List<Car> carsSmall;
	private Car selectedCar;

    static {
		colors = new String[10];
		colors[0] = "Black";
		colors[1] = "White";
		colors[2] = "Green";
		colors[3] = "Red";
		colors[4] = "Blue";
		colors[5] = "Orange";
		colors[6] = "Silver";
		colors[7] = "Yellow";
		colors[8] = "Brown";
		colors[9] = "Maroon";

		manufacturers = new String[10];
		manufacturers[0] = "Mercedes";
		manufacturers[1] = "BMW";
		manufacturers[2] = "Volvo";
		manufacturers[3] = "Audi";
		manufacturers[4] = "Renault";
		manufacturers[5] = "Opel";
		manufacturers[6] = "Volkswagen";
		manufacturers[7] = "Chrysler";
		manufacturers[8] = "Ferrari";
		manufacturers[9] = "Ford";
	}



	public TableBean() {
		carsSmall  = new ArrayList<Car>();
		populateRandomCars(carsSmall, 10);
	}

    private void populateRandomCars(List<Car> list, int size) {
		for(int i = 0 ; i < size ; i++)
			list.add(new Car(getRandomModel(), getRandomYear(), getRandomManufacturer(), getRandomColor()));
	}

	public Car getSelectedCar() {
		return selectedCar;
	}
	public void setSelectedCar(Car selectedCar) {
		this.selectedCar = selectedCar;
	}

	public List<Car> getCarsSmall() {  
        return carsSmall;  
    } 

    private int getRandomYear() {
		return (int) (Math.random() * 50 + 1960);
	}

	private String getRandomColor() {
		return colors[(int) (Math.random() * 10)];
	}

	private String getRandomManufacturer() {
		return manufacturers[(int) (Math.random() * 10)];
	}

	private String getRandomModel() {
		return UUID.randomUUID().toString().substring(0, 8);
	}
}

Aguardo

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