xbr400 pronto code for 'squeeze'

As many have noticed, the XBR400s do not perform auto detection of anamorphic material on a 480p signal. (Example Thread) I am about to put an iScan Pro into the stream which will feed 480p to my 36XBR400. Since I may well want to include my interlaced DVD player in the sources for the iScan (I suspect iScan's de-interlacer is better than Sony's, but I'll test of course), I'd like to find a way to quickly switch the TV from 4:3 to 16:9. Fortunately, I have a Pronto.


All of which is a long way of getting to the question: Does anyone have a Pronto code for switching the XBR400 from 16:9 to 4:3 and/or back?


Thanks,


Curtis