radio picon as screensaver

I'm trying to do a totally useless thing (like almost everything I do) , but I don't find the way to do it.

I'm trying to change the OpenPli screensaver logo to make the radio picon (if available) appear.

In /usr/lib/enigma2python/Screens/ , I edit ScreenSaver.py

I change line 14

<widget name="picture" pixmap="skin_default/screensaverpicture.png" position="0,0" size="150,119" alphatest="blend" transparent="1" zPosition="1"/>

To these ones:

<widget name="picture" source="session.CurrentService" render="Picon" position="0,0" size="150,90" alphatest="blend" transparent="1" zPosition="1">
	<convert type="ServiceName">Reference</convert>
</widget>

But it doesn't appear anything.

What I'm doing wrong ??

If I delete name="picture" it appears the radio picon, but it stays top left, no moving at all.