JSF binding command button in a node of treeTable dynamically

I'm creating a rootNode in backing bean dynamically. I am binding all components attributes in that node perfect without the "binding" attribute.

Here is my xhtml;

<h:form id="form">
        <p:treeTable value="#{treeBean.rootNode}" var="gorev" animate="true" resizableColumns="true">
            <p:column headerText="#">
                <h:outputText value="#{gorev.id}" style="font-weight: bold" />
            </p:column>

            <p:column headerText="Görev">
                <h:outputText value="#{gorev.gorevAciklama}" styleClass="wordWrap"/>
            </p:column>

            <p:column headerText="Sonuç">
                <p:commandButton id="okBtn2" icon="tickIcon" ajax="false" binding="#{gorev.okBtn}"
                    action="#{treeBean.onOk(gorev)}" styleClass="iconOnlyButton" />

                <p:commandButton id="cancelBtn2" icon="deleteIcon" ajax="false" 
                    action="#{treeBean.onCancel(gorev)}"
                    styleClass="iconOnlyButton" />
            </p:column>

            <p:column headerText="Açıklama">
                <p:inputText value="#{gorev.aciklama}" />
            </p:column>
        </p:treeTable>
    </h:form>

Here is my model;

public class GorevModel implements Serializable {

    private static final long serialVersionUID = -4706690834717398493L;

    public GorevModel() {
    }

    public GorevModel(int Id, String GorevAciklama, GorevModel Gorev) {
        setId(Id);
        setGorevAciklama(GorevAciklama);
        setGorev(Gorev);
    }

    private int id;
    private String gorevAciklama;
    private String aciklama;
    private Timestamp tahminiSure;
    private Timestamp baslangicTarihi;
    private Timestamp bitisTarihi;
    private Proje proje;
    private GorevTamamlanmaTip gorevTamamlanmaTip;
    private Rol rol;
    private Set<GorevModel> gorevs;
    private GorevModel gorev;

    private HtmlCommandButton okBtn;



> //Getters Setters

}

As you can see i'm trying to bind okBtn2(binding="#{gorev.okBtn}") to representing model dynamically for each node.

I need this to setStyleClass of each commandbutton in backing dynamically.

If this kind of binding is not possible, do you have any idea how to achive to changing style of a button in a treeNode dynamically?