still fieldstack problem

[Patrick Gundlach <pg@levana.de>]

Hi, 
posting my question from sep. 30 again:

I don't know how to use fieldstack, as described in the metafun handbook 
and the uptodate 1. I have tried the following,

----------------------------------------
\setupinteraction[state=start]
\definesymbol[step1][A]
\definesymbol[step2][B]
\definesymbol[step3][C]
\definefieldstack
   [anim]
   [step1, step2, step3]
   [frame=off]
\starttext
\placefigure[here][fig:myconst]
 {foo \goto{here}[JS(Walk_Field{anim})] bar}
 {\fieldstack[anim]}
\stoptext
---------------------------------------

If I understand this correctly, there should be an 'A' displayed in the 
figure and when I click on 'here' there should be a 'B' in the figure. But 
I cannot see any letter at all (except for the figure caption). What am I 
doing wrong?

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-- 
Viele Grüße, 

    Patrick Gundlach