Commandbutton marche une seule fois

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<rich:modalPanel id="addRole" height="470" width="600"
resizeable="false">
<f:facet name="header">
<h:outputText value="Attribution des rôles de l'utilisateur" />
</f:facet>
<f:facet name="controls">
<h:graphicImage value="/images/close.gif" style="cursor:pointer"
onclick="Richfaces.hideModalPanel('addRole')" />
</f:facet>
 
<h:form id="attr">
    <table width="100%" height="10%">
            <tr>
                            <td width="50%" height="20" align="center" bgcolor="#e3eefa"
                                    style="font-size: 11px; font-weight: bold">
                                    <h:outputText value="Login" />
                                </td>
                                <td width="50%" height="20" bgcolor="#fff0ff"
                                    style="font-size: 11px; font-weight: lighter">
                                    <h:outputText id="modRoleTxtLogin" value="#{userGroupe.login}" />
                                </td>
                            </tr>
                        </table>
 
                        <rich:spacer height="10" />
                        <rich:separator lineType="dotted" height="4" width="100%" />
                        <rich:spacer height="10" />
 
                        <h:panelGrid columns="2" id="panel">
                            <rich:pickList id="modRolePickList" sourceListWidth="255"
                                showButtonsLabel="false" targetListWidth="200" listsHeight="150"
                                value="#{roleUsr.selection}">
                                <f:selectItems value="#{roleEtat.listIntituleRole}" />
                            </rich:pickList>
 
                            <a4j:commandButton id="valider" image="/images/valider.gif"
                                title="Valider" action="#{roleUsr.saveRole}"
                                reRender="modRoleListDroit,treeUserRole">
                            </a4j:commandButton>
                        </h:panelGrid>
 
 
                        <rich:panelBar height="195">
                            <rich:panelBarItem label="Les rôles actuels pour cet utilisateur"
                                name="Roles">
                                <rich:dataTable id="modRoleListDroit" width="550"
                                    value="#{roleUserEtat.listRoleUserEtatParLogin}" var="item">
                                    <rich:column width="270">
                                        <h:outputText value="#{item.intitulerole}" />
                                    </rich:column>
                                    <rich:column width="100">
                                        <h:outputText
                                            value="#{item.etatroleusr=='1'?'ACTIVÉ':item.etatroleusr=='0'?'DÉSACTIVÉ':''}" />
                                    </rich:column>
                                    <rich:column width="35">
                                        <a4j:commandButton image="/images/ok.jpg"
                                            style="cursor:pointer; width:20 ; length:20" title="Activer"
                                            action="#{roleUsr.activerRoleUsr}" ajaxSingle="true"
                                            reRender="modRoleListDroit,treeUserRole">
                                            <f:setPropertyActionListener value="#{item.idroleusr}"
                                                target="#{roleUsr.idroleusr}" />
                                        </a4j:commandButton>
                                    </rich:column>
                                    <rich:column width="35">
                                        <a4j:commandButton image="/images/no.jpg"
                                            style="cursor:pointer; width:20 ; length:20"
                                            title="Désactiver" ajaxSingle="true"
                                            action="#{roleUsr.desactiverRoleUsr}"
                                            reRender="modRoleListDroit,treeUserRole">
                                            <f:setPropertyActionListener value="#{item.idroleusr}"
                                                target="#{roleUsr.idroleusr}" />
                                        </a4j:commandButton>
                                    </rich:column>
                                    <rich:column width="30">
                                        <a4j:commandButton image="/images/delete.gif"
                                            style="cursor:pointer; width:20 ; length:20"
                                            title="Supprimer" ajaxSingle="true"
                                            action="#{roleUsr.deleteRoleUsr}"
                                            reRender="modRoleListDroit,treeUserRole,modRolePickList">
                                            <f:setPropertyActionListener value="#{item.idroleusr}"
                                                target="#{roleUsr.idroleusr}" />
                                        </a4j:commandButton>
                                    </rich:column>
                                </rich:dataTable>
                            </rich:panelBarItem>
                        </rich:panelBar>
                    </h:form>
                </rich:modalPanel>