another Cancel button question

[ag...@custis.ru]

Hello.
Stupid situation.
dataTable, row on click -> show Edit Form that have one field and 2
buttons (Save and Cancel). Also i have newItem_button, which show the
same form.

Problem with Cancel. I emulate problem with such bit of code (without dataTable):

page:
<h:form id="foo">
  <h:commandButton id="new" type="submit" value="Add New" actionListener="#{testBean1.newUser}"/>
  <h:commandButton id="show" type="submit" value="Show Existed" actionListener="#{testBean1.showUser}"/>

  <t:panelGrid columns="2" rendered="#{testBean1.user!=null}">
    <h:outputLabel for="id">
      <h:outputText value="Id:"/><h:outputText value="*" style="color:red"/>
    </h:outputLabel>
    <h:inputText id="id" size="32" value="#{testBean1.user.id}" required="true">
      <f:validateLength maximum="32"/>
    </h:inputText>

    <h:commandButton id="backCmd1" type="submit" value="Back1" actionListener="#{testBean1.backActionLsnr}"
        rendered="#{testBean1.user.id != null}"
        onclick="if (document.getElementById('foo').reset()) return true;"/>
    <h:commandButton id="backCmd2" type="submit" value="Back2" action="#{testBean1.backAction}"
        rendered="#{testBean1.user.id == null}" immediate="true"/>
  </t:panelGrid>
</h:form>

Bean:
public TestBean1 {

  private User user = null;
  public void backActionLsnr(ActionEvent e) {
    user = null;
  }

  public String backAction() {
    user = null;
    return null;
  }

  public void showUser(ActionEvent e) {
    user = new User();
    user.setId(new Long(10));
  }

  public void newUser(ActionEvent e) {
    user = new User();
  }

  class User {
    private Long id;
    public User() {}
    public Long getId() {
      return id;
    }
    public void setId(Long id) {
      this.id = id;
    }
  }
}

i have 2 buttons - createNew  && showExisted.
When I click showExisted the input field is appeared with value=10.
i click Back1. It set "user = null" and hide field.
When i click createNew the input field is appeared with value=null.
i click Back2, it skip id validation, set "user = null" and hide field.
All is fine.
Now i click ShowExisted again and i see *empty field* and button Back1.
Trying to click Back1. validation failed and form freezed (i can do
nothing with it).

myfaces 1.1.1

So, i have 2 question
1. where is my fault?
2. may be there is another solution for this task?

It looks like a bug

[GAAA <ag...@custis.ru>]

<h:inputText render incorrect value...
after pressing "ShowExisted" button we get -  

HtmlTextRendererBase.renderInput(...)  {
...
String value = RendererUtils.getStringValue(facesContext, component);
...
writer.writeAttribute(HTML.VALUE_ATTR, value, JSFAttr.VALUE_ATTR);
...
}

RendererUtils.getStringValue(...) {
..
if (submittedValue != null) {
  if (submittedValue instanceof String) return (String)submittedValue;
  else throw something;
}
..
}

yes, submittedValue = "", it is not null and it is instance of String... but
component.getValue = Long(10).
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