Components using an Alias bean are rendered when it's parent tabbedpane is not! This is causing a javax.faces.FacesException?

[Paul Spencer]

(MyFaces + Tomahawk both 1.1.4-SNAPSHOT and 1.1.5-SNAPSHOT)
I have defined an aliasBean in a tabbed pane.  If that tab is not the 
current tab, the components that use the aliased bean are rendered even 
though they are not displayed on the page.  This becomes a problem when 
the rendering fails.

**
* The example below is simplified version of what I am trying to do.
**
The pages initially displays the tab "Summary Report" and none of the 
radio button are selected. When I select the tab "Finance Report" and 
select any of the radio buttons, I see the following:

1) The valueChangeAction is called.
2) The  exception "javax.faces.FacesException: Value is no String"
   is displayed.  In addition the error references the following
   components:
  {Component-Path :
    [Class: javax.faces.component.UIViewRoot,ViewId: /query.jsp]
    [Class: 
org.apache.myfaces.custom.tabbedpane.HtmlPanelTabbedPane,Id: _idJsp1]
    [Class: org.apache.myfaces.custom.tabbedpane.HtmlPanelTab,Id: _idJsp2]
    [Class: javax.faces.component.html.HtmlForm,Id: SummaryForm]
    [Class: org.apache.myfaces.custom.aliasbean.AliasBean,Id: test_ab]
    [Class: javax.faces.component.UINamingContainer,Id: test]
    [Class: javax.faces.component.html.HtmlSelectOneRadio,Id: test_s1r]
  }



** JSP code

<t:panelTabbedPane>
 <t:panelTab label="Summary Report">
    <h:form id="SummaryForm">
      <t:aliasBean id="test_ab" alias="#{manager1}"
                   value="#{SummaryManager}">
        <f:subview id="test">
           <h:selectOneRadio id="test_s1r"
                   value="#{manager1.periodType}">
             <f:selectItem itemLabel="Month To Date" itemValue="mtd" />
             <f:selectItem itemLabel="Current Day" itemValue="now" />
           </h:selectOneRadio>
        </f:subview>
      </t:aliasBean>
    </h:form>
 </t:panelTab>
 <t:panelTab label="Finance Report">
    <h:form>
      <t:aliasBean alias="#{manager}"
                   value="#{financeManager}">
        <f:subview id="test">
           <h:selectOneRadio value="#{manager.periodType}"
                     valueChangeListener="#{manager.changePeriodType}"
                     onclick="submit();">
             <f:selectItem itemLabel="Month To Date" itemValue="mtd" />
             <f:selectItem itemLabel="Current Day" itemValue="now" />
           </h:selectOneRadio>
        </f:subview>
      </t:aliasBean>
    </h:form>
 </t:panelTab>
</t:panelTabbedPane>


Note: If the #{SummaryManager.periodType} is not null, every thing work 
as expected :(


1) Is this a bug?

2) Suggested workarounds?

Paul Spencer