about reRender?

[rageice]

Hello everybody, and sorry for my bad english.

Can someone explain me, in the following code, why when I click on display, HELLO2 is displayed and not HELLO1. (same thing for hide)

    <h:form id="tmp1">
        <a4j:commandLink
            value="display"
            actionListener="#{Test.need_display}"
            reRender="tmp2,tmp3"
        />
        <rich:spacer width="20"/>
        <a4j:commandLink
            value="hide"
            actionListener="#{Test.need_hide}"
            reRender="tmp2,tmp3"
        />
    </h:form>

    <h:form id="tmp2" rendered="#{Test.display}">
        <h:outputText value="HELLO1" />
    </h:form>

    <h:panelGrid id="tmp3">
        <h:outputText rendered="#{Test.display}" value="HELLO2"/>
    </h:panelGrid>