Q:

Partial Rendering will only work with @form?

I have a strange situation where using @parent, or even explicit id-s dont work in the update attribute. But @form works fine.
I've made a very simple test case, that includes a simple grid whose behaviour is like this :

Every record inside the grid has a modify button
After the modify button is clicked, it'll modify the server data, and the button will be gone, since it'll be only rendered if the record has NOT been modified.

The modify button is like this :
<!-- this works, since it's using @form in the update attribute -->
<p:column>
    <p:commandLink
        value="modify record" 
        process="@this" 
        action="#{testUserBean.modifyRecord(user)}"
        update="@form"
        rendered="#{not testUserBean.isRecordModified(user)}" />
</p:column>

Notice that the update attribute makes use of @form which makes it work: when the modify button is clicked, it rerenders and disappears. 
Substitute it with @this or @parent or the id of the grid, then it will NOT work. For me it's very logical to use the id of the grid in the update attribute, since i would like to refresh the grid after clicking on the buttton.
I tried making use of rowIndexVar="rowIndex" and myGridId:#{rowIndex}:link, but still aint working.
<!-- this does not work -->
<p:column>
    <p:commandLink id="link"
        value="modify record" 
        process="@this" 
        action="#{testUserBean.modifyRecord(user)}"
        update="tblUser"
        rendered="#{not testUserBean.isRecordModified(user)}" />
</p:column>

Here are the resources for this simple example :

The xhtml file
The JSF Bean file
The user POJO bean

Im using tomcat 7, and these are my dependencies :
<dependency>
    <groupId>org.primefaces</groupId>
    <artifactId>primefaces</artifactId>
    <version>2.2.1</version>
</dependency>
<dependency>
    <groupId>com.sun.faces</groupId>
    <artifactId>jsf-api</artifactId>
    <version>2.0.4-b09</version>
    <scope>compile</scope>
</dependency>
<dependency>
    <groupId>com.sun.faces</groupId>
    <artifactId>jsf-impl</artifactId>
    <version>2.0.4-b09</version>
    <scope>compile</scope>
</dependency>

Tried out primefaces 3.0.M1 also, but it got the same behavior also.
Please share your ideas. Is this a bug or i did something wrong ?

UPDATE

Hello,
I've just finished some testing, but all still fails.
Test 1 (making use of update=":gridRPBDetails") :
The JSF File :
<p:commandLink id="undoLink" value="Undo" process="@this"
    action="#{tInputBean.actionUndoRemoveRecord(rpbDetail)}"
    update=":gridRPBDetails"
    rendered="#{tInputBean.isRemoveRecord(rpbDetail)}"
    title="Batalkan buang data" />

The generated xhtml :
<a title="Batalkan buang data" onclick="PrimeFaces.ajax.AjaxRequest('/cashbank/faces/TInput.xhtml',
{formId:'j_idt38',async:false,global:true,source:'gridRPBDetails:0:undoLink',
process:'gridRPBDetails:0:undoLink',update:':gridRPBDetails'});" 
href="javascript:void(0);" id="gridRPBDetails:0:undoLink">Undo</a>

Test 2 (making use of update=":gridRPBDetails:#{rowIndex}:undoLink") :
The JSF File :
<p:commandLink id="undoLink" value="Undo" process="@this"
    action="#{tInputBean.actionUndoRemoveRecord(rpbDetail)}"
    update=":gridRPBDetails:#{rowIndex}:undoLink"
    rendered="#{tInputBean.isRemoveRecord(rpbDetail)}"
    title="Batalkan buang data" />

The generated xhtml :
<a title="Batalkan buang data" onclick="PrimeFaces.ajax.AjaxRequest('/cashbank/faces/TInput.xhtml',
{formId:'j_idt38',async:false,global:true,source:'gridRPBDetails:0:undoLink',
process:'gridRPBDetails:0:undoLink',update:':gridRPBDetails:0:undoLink'});" 
href="javascript:void(0);" id="gridRPBDetails:0:undoLink">Undo</a>

Both tests still fail in terms of clicking the undo button cannot refresh the record of the grid, or even the grid itself.

UPDATE

I've just updated my test using :
<p:commandLink
    value="modify record" 
    process="@this" 
    action="#{testUserBean.modifyRecord(user)}"
    update=":mainForm:tblUser"
    rendered="#{not testUserBean.isRecordModified(user)}" />

Notice i used the :mainForm:tblUser, and i've tried the other options and still failed :

:mainForm:tblUser:
:tblUser (when i dont define the form name)
:mainForm:tblUser:#{rowIndex}:linkId

But 1 thing i notice is,nNo matter what i choosed for the update, the update always ends up as tblUser:0
<a onclick="PrimeFaces.ajax.AjaxRequest('/cashbank/faces/test.xhtml',
{formId:'mainForm',async:false,global:true,source:'tblUser:0:j_idt33',
  process:'tblUser:0:j_idt33',
  update:'tblUser:0'
});" href="javascript:void(0);" id="tblUser:0:j_idt33">modify record</a>

I tried modifying tblUser:0 on the fly using firebug to just tblUser, the partial rendering on the grid works fine.
Im beginning to think that this is a bug when trying to update a grid from inside a grid record.

A:

This has been answered in here.
Here is the quote from the answer :

This is more like a mojarra issue, it should work fine with myfaces
  without a wrapper. Workaround is to put a wrapper.

  Code:
    <h:form id="frm">
       <p:outputPanel id="wrapper">
           <p:dataTable id="tbl">
           //...
               <p:commandButton update=":frm:wrapper" />
           //...
           <p:dataTable>
       <p:outputPanel>
    </h:form>

Sorry for the late update !

