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The drilldown in this example is done in the traditional SAS/Graph way ...


First, a character variable is created, containing the html tags for
the drilldown (href=) and the text charttip/rollover-text (title=) 
as follows ...

   length htmlvar $500;
   htmlvar='title='||quote(
    'State: '|| trim(left(st)) ||'0D'x||
    'Population: '|| trim(left(put(population,comma12.0)))
   )
   ||' '||
    'href="http://www.state.'||trim(left(lowcase(st)))||'.us"';


Then that variable is specified using the "html_legend=" option in the
SAS/Graph "proc gchart" as follows (this is very similar to using the
html= option, but this puts the drilldowns on color/pattern squares
in the legend, rather than on the bars themselves)...

   proc gchart data=mydata;
   hbar st / discrete
    subgroup=st
    type=sum sumvar=population
    ascending
    nostats
    maxis=axis1
    raxis=axis2
    autoref cref=gray
    clipref
    coutline=black
    legend=legend1
    html_legend=htmlvar            <--------  here!
    des="" name="&name" ;
   run;


And the output is created using ODS HTML, and "goptions device=gif",
so that a gif file is created containing the gif, and an html file 
is created containing the html charttips & drilldowns.  The user will
view the html file, and it will display the gif image.


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