[squeakland] How can you make a graphic in Etoys transparent?

[Steve Thomas]

How can you specify the alpha for a sketch?  I was using the Fractionator as
described in this
post<http://mrstevesscience.blogspot.com/2011/08/fraction-day-day-34-is-it-half-star.html>
and
it would be nice to be able to set the sketch's transparency.  I can add an
extra transparent playfield (which shows the gridlines even when alpha=0,
which is nice) but the ability to set a sketch's alpha would be useful.

Stephen
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