The refreshOnShow attribute in tabbedPanel does not work

Just upgrate my current project from 2.0.1 to 2.0.5, but unfortunately the new div which is used to replace previous panel tag does not run correctly based on the document:
refreshOnShow : Content will be loaded when div becomes visible, used only inside tabbedPanel

it does not work, I modify the example example3.jsp under struts2-showcase-2.0.5\ajax\tabbedpanel,

<s:tabbedPanel id="test2" theme="ajax" cssStyle="width: 500px; height: 300px;" doLayout="true">
<s:div theme="ajax" id="left" label="left" refreshOnShow="true" >
This is the left pane<br/>
<s:form >
<s:textfield name="tt" label="Test Text" /> <br/>
<s:textfield name="tt2" label="Test Text2" />
</s:form>
</s:div>
<s:div theme="ajax" href="%

{ajaxTest}" id="ryh1" label="remote one" refreshOnShow="true"/>
<s:div theme="ajax" id="middle" label="middle" refreshOnShow="true">
middle tab<br/>
<s:form >
<s:textfield name="tt" label="Test Text44" /> <br/>
<s:textfield name="tt2" label="Test Text442" />
</s:form>
</s:div>
<s:div theme="ajax" href="%{ajaxTest}

" id="ryh21" label="remote right" refreshOnShow="true"/>
</s:tabbedPanel>

The attribute refreshOnShow does not affect anything. The two remote tabs always return the same result

BTW: in the release note, why I don't see any places talk about the removal of panel tag.

2.0.5 is a great improve comparing with 2.0.1(I check out the code everyday but no time to test it, because it is quite often the build progress is broken), as what I see on the screen effect and performance, but unfortunately refreshOnShow feature is key functionality to my project, so I just rollback to 2.0.1, hope this can be solved soon then I can enjoy the new features.