Comment 13 for bug 889414

#9 works perfectly here, You can see where I added the code:

andy@D420:~$ tail ~/.config/openbox/lubuntu-rc.xml
  </application>

  # end of the example
-->
  <application name="lxpanel"
                 type="dialog">
      <focus>yes</focus>
    </application>
  </applications>
</openbox_config>

Log off then on and it's fine. Precise Ubuntu 32bit here