IE6 incompatibilities in ZK

There's a very annoying IE6 incompatibility in ZK.

<window title="I hate IE6" border="normal">
  <popup id="popup">
    <label value="Fail" />
  </popup>
  <label value="Click me" popup="popup" />
</window>

When you click the label "Fail", you'll get a popup that is sized by its contents.... .... except in IE6 where the popup always has 100% width.

This can of course be fixed by specifying a fixed width for the popup, but this is typically ugly. If the application supports localization, you'll be forced to guess a good width for all localizations.