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From: Hans Hagen <pragma@wxs.nl>
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Subject: Re: \button does not appear
Date: Tue, 17 Oct 2000 17:59:01 +0200
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Cc: ntg-context@ntg.nl, roegel@lorraine.loria.fr (Denis B. Roegel)
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At 04:23 PM 10/17/00 +0200, Denis B. Roegel wrote:
>On page 76 of the metafun manual, there is an example
>with \button. But when I try to compile the following
>file, I can see no button. Actually, no dvi file is generated.
>What am I missing?
>
>I am using the TL5 + Sep. 21 context.
>
>Thanks,
>
>Denis
>
>\setupcolors[state=start]
>\starttext
>
>\def\MyGraphic%
>  {\startreusableMPgraphic{name:\overlaywidth:\overlayheight}
>     path p ; p := unitsquare
>       xscaled \overlaywidth yscaled \overlayheight ;
>     fill p withcolor .625yellow ;
>     draw p withcolor .625red ;
>   \stopreusableMPgraphic
>   \reuseMPgraphic{name:\overlaywidth:\overlayheight}}
>
>\defineoverlay[my graphic][\MyGraphic]
>\button[background=my graphic,frame=off]{Go Home}[firstpage]

\startreusableMPgraphic{xxx}
.... 
\stopreusableMPgraphic

\defineoverlay[my graphic][\reuseMPgraphic{xxx}]

etc etc is more convenient

the buttons will show up when you say: 

\setupinteraction[state=start]

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