Encore CS3: how insert a 16:9 anamorphic video

Hello,
I have a question...

I have an uncompressed MOV 720x576 (PAR 1,067) and it looks squeezed horizontaly like anamorphic video...
If I encode the uncompressed clip in MPEG2, I obtain a squeezed (DAR 4:3) clip that plays squeezed again in the DVD player. I thought there was a way to tell Encore to flag it as a 16:9 so that it'll be recognized from the DVD player as an anamorphic video (and then widescreened on 16:9 TV or letterboxed on 4:3 TV).

Someone knows if there is that flag in Encore? Or maybe my uncompressed MOV must be converted to a PAL 720x576 (PAR 1,42) BEFORE the MPEG2 encoding (or better, tell to the MPEG2 encoder to expand it at 16:9)?

Regards,
Alessio