FieldGroup + InternetExplorer 9 - update Fields fails

Hi,

I have a strange situation:
In a FieldGroup some Fields are set to
readOnly
and also to
required
.
On button click the underlaying bean is exchanged (via [b]
setBean
/b).

This works perfectly in FF and Chrome, but not in Internet Explorer 9.
In those fields (readOnly and required) the content of the exchanged bean is not displayed until I click onto the TextField.

Using the vaadin debugger I see that the content is available, but IE doesn’t render it.

Does anybody has an idea where I could search for this error?

Regards