Map Dashboard widget

How can I debug what is going wrong with the widget?
No obvious Javascript errors or failed connections.

Looking at the page source I see the following Javascript function.
I would expect £37 to be be shown on the map when hovering over UK.
If I change showlegend to true I see a legend display showing £37.

google.load('visualization', '1', {'packages':['geomap']});
google.setOnLoadCallback(drawChart_5);
function drawChart_5() {
  var data = new google.visualization.DataTable();
  data.addColumn('string', 'Code');
  data.addColumn('number', 'Sales');
  data.addColumn('string', 'Country');
  data.addRows(1);
  data.setValue(0, 0, 'GB');
  data.setValue(0, 1, 37);
  data.setValue(0, 2, 'United Kingdom');
  var options = {};
  options['dataMode'] = 'regions';
  options['width'] = '300px';
  options['height'] = '210px';
  options['showLegend'] = false;
  options['region']='155';
  var chart = new google.visualization.GeoMap(document.getElementById('graph_5'));
  chart.draw(data, options);
}

Thanks, will investigate later.

Turns out if I set the zone to All or Northern Europe the hover over works.
If I set it to Western Europe even though part of GB is shown the hover over does not work.
Really need some more options, like an all of Europe region, but Google don't appear to support that.

code.google.com/apis/chart/interactive/docs/gallery/geomap.html

I see there is a crude zoom-in feature together with zoomout / region click events which might be a way of providing a solution.