Thnaks Jork,
I checked in the skin_display.xml file and it seems activated and so I put "0" for the position but nothing changed:
<!-- channelselection -->
<screen name="ChannelSelection_summary" position="0,0" size="400,240">
<widget source="parent.Service" render="Picon" position="55,0" size="150,90" zPosition="0" alphatest="on">
<convert type="ServiceName">Reference</convert>
Anyway it is not really a blocking issue so I can wait next image release for a possible fixing.
I appreciate your fast and accurate support !!!
Have a nice day
Dario