Passing parameter to Bean

Hello !

I'm developing a WebApp using this example where I:
1. Connect to MySQL and download data.
2. Populate dataTable with downloaded data using.
3. Fetch(view button) the record and display its details in a dialog.

Problem begins when I download the records and click on the viewButton(no matter what record) it displays in a dialog only the first downloaded record.

My problem is in line:

<f:setPropertyActionListener value="#{car}" target="#{tableBean.selectedCar}" />

The aplication pattern:
jsp -> managedBean -> sessionBean -> entityBean

My code:

JSP:

 <h:form id="form">
    <p:growl id="msgs" showDetail="true" /> 

       <p:dataTable  
            id="dataTable" 
            selection="true"  
            value="#{cars.getCarList()}" 
            var="car" 
            style="font-size: 12px">
             <f:facet name="header"> //header  
              <p:commandButton 
                value="Download all Cars" 
                id="button" 
                update="dataTable" 
                actionListener="#{car.getAllQuery()}"
                />

            </f:facet>

                        <p:column>  
                            <f:facet name="header">  
                                <h:outputText value="id" /> 
                            </f:facet>  
                            <h:outputText value="#{car.id}" />  
                        </p:column>  

                        <p:column>  
                            <f:facet name="header">  
                                <h:outputText value="Name" />  
                            </f:facet>  
                            <h:outputText value="#{car.name}" />  
                        </p:column> 

                        <p:column style="width:4%">  

                            <p:commandButton 
                                id="selectButton" 
                                update=":form:dataTable:tabView" 
                                oncomplete="carDialog.show()" 
                                title="View" 
                                icon="ui-icon-search">  
                                **  <f:setPropertyActionListener 
                                        value="#{car}" 
                                        target="#{cars.getSelected(car)}" 
                                        /> //main problem**
                            </p:commandButton>  

                         <p:dialog  header="Details"
                              widgetVar="carDialog" 
                              width="1000" height="700"
                              id="carDialog"
                              closable="true" 

                              > 



                        <p:tabView id="tabView" >  

                            <p:tab 
                                id="tab1" 
                                title="Details" >  
                                    <h:panelGrid columns="2">
                                        <p>Id: #{car.id}</p>
                                        <p>Name: #{car.name}</p>                                  
                                    </h:panelGrid>
                            </p:tab>  

                            <p:tab id="tab2" title="SomeText">  
                                <h:panelGrid columns="2" cellpadding="10">  

                                    <h:outputText 
                                        id="tab2Text" 
                                        value="Some text"
                                        />  
                                </h:panelGrid>  
                            </p:tab>  
                        </p:tabView>                            
                    </p:dialog>       
                  </p:column>  
                 </p:dataTable>
                </h:form> 

ManageBean:

@Named
@RequestScoped
public class Cars implements Serializable {

    @EJB(name="carBean")
    private CarBean carEJB;
    private CarEntity car;
    private List<CarEntity> carList;


    Car(){
        List<CarEntity> list = new ArrayList();
    }

   public List<CarEntity> getCarList(){    
     return carList;
  }  

  public CarEntity getSelected(CarEntity car){
      car = carEJB.get(car);
      return car;
  }

  public void getAll(){ 
      carList = carEJB.getCars();    
} 


}

SessionBean:

@Stateless
@LocalBean
public class CarBean {

    @PersistenceContext(name="CarsSystemPU")
    private EntityManager em;


    public List<carEntity> getCars(){       
        Query query = em.createNamedQuery("CarsEntity.findAll");
        return query.getResultList();  
    }

    public CarEntity get(CarEntity car){      
        return em.find(CarEntity.class, car);
    }

}

EntityBean:

@Entity
@Table(name = "cars")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "CarEntity.findAll", query = "SELECT p FROM CarEntity p"),
    @NamedQuery(name = "CarEntity.findById", query = "SELECT p FROM CarEntity p WHERE p.id = :id"),
    @NamedQuery(name = "CarEntity.findByName", query = "SELECT p FROM CarEntity p WHERE p.name = :name");

public class CarEntity implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @NotNull
    @Size(min = 1, max = 11)
    @Column(name = "id")
    private String id;
    @Size(max = 45)
    @Column(name = "name")
    private String name;

    public CarEntity() {
    }

    public CarEntity(String id) {
        this.id = id;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

}