<p:commandButton value="Buscar" id="pesquisa"
    class="ui-button-custom ui-button-busca"
    action="#{fluxo.veiculos}" process="@form"
    update="@form" onclick="PF('statusDialog').show();" />

    <p:dialog id="mod" modal="true" widgetVar="statusDialog" header="Status"
         draggable="false" closable="false">
       <h:form id="idformdialog">
        <div class="modal-content">
         <p:graphicImage id="image" url="#{fluxoPeriodo.displayImage}" />
         <h:outputText id="txt_count"value="#fluxoPeriodo.displayMessage}"/>
        </div>

        <div  class="modal-content">
          <p:graphicImage url="#{fluxoPeriodo.displayImage2}" />
           <h:outputText value="#{fluxoPeriodo.displayMessage2}" />
        </div>

        </h:form>
        </p:dialog>