http://forum.team-mediaportal.com/threads/skin-setfocus-does-not-work-in-onfocus-handler.119658/

Maybe related to http://issues.team-mediaportal.com/browse/MP1-2560

When using skin.setfocus in an onfocus handler, the focus is "split" and later focus changes may be broken (navigation with key/remote not correctly possible anymore). Exact steps to reproducs & skin snippets found in linked forum thread.