How to keep a portlet's state across re-renders?

Question

Scenario:
Portlet is held within a panelgrouplayout with rendered="{PortletBean.portletRendered}";  However, when portletRendered flag is flipped, the portlet immediately loses it's state and on next render, it's as if I'm accessing the portlet for the first time.  Below is a fast test case using Untitled1Backing for same effect.
Sample Consumer Page:
<af:form id="f1">
        <af:panelGroupLayout id="pgl2">
        <af:panelGroupLayout id="pgl1"
                              rendered="#{Untitled1Backing.portletRendered}">
        <adfp:portlet value="#{bindings.SandboxPortlets2untitled1jspx1_1}"
                      id="portlet1" title="Test1"/>
        </af:panelGroupLayout>
        <af:commandButton text="Unrender" id="cb1"
                          action="#{Untitled1Backing.unrender}"
                          />
        <af:commandButton text="Render" id="cb2"
                          action="#{Untitled1Backing.render}"
                          />
        </af:panelGroupLayout>
      </af:form>
Sample Producer Page:
<af:form id="f1">
<af:selectOneChoice label="Select a Value:"
id="soc1">
<af:selectItem label="1_value" value="1_value." id="si1"/>
<af:selectItem label="2_value." value="2_value." id="si2"/>
<af:selectItem label="3_value." value="3_value." id="si3"/>
<af:selectItem label="4_value." value="4_value." id="si6"/>
</af:selectOneChoice>
</af:form>

Answer 1

Looks like even inline style hidden doesn't work.  After setting the values and doing an unrender/render toggle, the portlet's drop downs are:
Stateless: null <--Want Value0
Page1_State: Value2
Multi-Page_State: Value4
Below are the code segments:
Consumer:
<af:panelGroupLayout id="pgl1">
<af:panelGroupLayout id="pgl2"
partialTriggers="cb1 cb2"
inlineStyle="#{Untitled1Backing.stringRender}">
<adfp:portlet value="#{bindings.SandboxPortlets2untitled1jspx2_1}"
id="portlet1"/>
</af:panelGroupLayout>
<af:commandButton text="Render" id="cb1"
action="#{Untitled1Backing.render}"
partialSubmit="true" partialTriggers="cb1 cb2"/>
<af:commandButton text="Unrender" id="cb2"
action="#{Untitled1Backing.unrender}"
rendered="#{Untitled1Backing.portletRendered}"
partialSubmit="true" partialTriggers="cb1 cb2"/>
</af:panelGroupLayout>
Backing:
public String getStringRender() {
if(portletRendered)
return null;
else
return "visibility:hidden;";
Producer:
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.1"
          xmlns:af="http://xmlns.oracle.com/adf/faces/rich">
  <af:panelGroupLayout id="pgl1" layout="vertical">
    <af:selectOneChoice label="Stateless" id="soc1">
      <af:selectItem label="Value0" value="Value0" id="si1"/>
      <af:selectItem label="Value1" value="Value1" id="si2"/>
    </af:selectOneChoice>
    <af:selectOneChoice label="Page1_State"
                        value="#{selectOne_StateKeeper.page1String}"
                        id="soc2" valuePassThru="true" autoSubmit="true">
      <af:selectItem label="Value2" value="Value2" id="si4"/>
      <af:selectItem label="Value3" value="Value3" id="si5"/>
    </af:selectOneChoice>
    <af:selectOneChoice label="Multi-page_State"
                        value="#{selectOne_StateKeeper.sharedString}"
                        id="soc3" valuePassThru="true" autoSubmit="true">
      <af:selectItem label="Value4" value="Value4" id="si3"/>
      <af:selectItem label="Value5" value="Value5" id="si6"/>
    </af:selectOneChoice>
    <af:commandButton text="Go to Page2" id="cb1" action="Page2"/>
  </af:panelGroupLayout>
</jsp:root>