reRender Calendar control problem

[akira_ag]

Hi!
I found for ajaxable form rerendering elements problem.
If the calendar control rerendering from a4j:commandButton, then the input element loss the pattern format.

Example:

<rich:calendar
id="myDate"
value="#{MyBean.myDate}"
inputType="readonly"
popup="true"
required="true"
/>

<a4j:commandButton id="myButton" value="Do It" action="#{MyBean.doIt}" reRender="myDate"/>

After successfully executed the action for button I see the incorrect date pattern "Wed Aug 22 00:00:00 MSD 2007" instead a default format.

[akira_ag]

Anybode can answer - it's bug or not?
AJAX rerendering this control are allowed?