What you probably want to use is the 'select' event, not 'regionClick'. 
 When the select event fires, you call the #getSelection method of the 
chart, which returns and object with row and/or column information so you 
can reference the DataTable to find out what the user clicked on.  You can 
then emulate a clicked link if you so desire (by setting window.location to 
whatever your desired destination is).  You would use the same method for 
both BarCharts and GeoMaps.

As an aside, the Flashed-based GeoMaps have been replaced with the 
SVG-based GeoCharts (which have less compatibility issues).  They don't *
quite* support the same feature set, but almost anything you can do in the 
GeoMaps, you can do in the GeoCharts.  I would recommend switching if there 
isn't anything you specifically need from the GeoMaps that the GeoCharts 
don't have.

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