Hello

I'm having the following problem,  I have a button to perform an action and an open modalpanel, but the modalpanel is not open,

code:

<ui:composition xmlns="http://www.w3.org/1999/xhtml" 
          xmlns:ui="http://java.sun.com/jsf/facelets"
          xmlns:h="http://java.sun.com/jsf/html"
          xmlns:f="http://java.sun.com/jsf/core"
          xmlns:a4j="http://richfaces.org/a4j"
          xmlns:rich="http://richfaces.org/rich">
          <h:form id="form" >
                    <rich:panel id="atividade" style="width:80%; height:100%; float: right; display: block;">
                              <a4j:commandLink action="#{atividade.BotaoBuscaEntrada_evento}"  reRender="evento_form" oncomplete="javascript:Richfaces.showModalPanel('evento_panelselecionaentrada');">
                                        <h:graphicImage url="/imagens/sinal_lista.png" style="border:0px; border-color:white;"/>
                              </a4j:commandLink>
                              <rich:panel style="width:500px; height:622px; background-color:rgb(240,240,240); " id="atividade_evento" >
                              .....
                              </rich:panel>
                    </rich:panel>
          </h:form> 
          <rich:modalPanel id="evento_panelselecionaentrada" autosized="true" keepVisualState="false" > 
                    <f:facet name="header">
                              <h:outputText value="Escolha ocorrencia"/>
                    </f:facet>
                    <f:facet name="controls">
                              <a4j:commandLink onclick="javascript:Richfaces.hideModalPanel('evento_panelselecionaentrada')">
                                        <h:graphicImage url="/imagens/fechar.png"></h:graphicImage>
                              </a4j:commandLink>
                    </f:facet>
                    <a4j:form id="evento_form" >
                              ......
                              <a4j:commandButton value="UTILIZAR" action="#{atividade.botaoEntradaSelecionada_evento}" reRender="atividade" oncomplete="javascript:alert('va');"></a4j:commandButton>
                    </a4j:form>
          </rich:modalPanel>



</ui:composition>

thanks