Customising tooltip in geocharts - google-maps

Question

In the given example given below
http://code.google.com/apis/chart/interactive/docs/gallery/geochart.html#Example
When i put my mouse the region in tooltip both population and area are displayed
Is there any way possible to display only any one of these variable(either population or area)
function drawMarkersMap() {
var data = new google.visualization.DataTable();
data.addColumn('string', 'City');
data.addColumn('number', 'Population');
data.addColumn('number', 'Area');
data.addRows([
['Rome', 2761477, 1285.31],
['Milan', 1324110, 181.76],
['Naples', 959574, 117.27],
['Turin', 907563, 130.17],
['Palermo', 655875, 158.9],
['Genoa', 607906, 243.60],
['Bologna', 380181, 140.7],
['Florence', 371282, 102.41]
]);
var options = {
region: 'IT',
displayMode: 'markers',
colorAxis: {colors: ['green', 'blue']}
};
var chart = new google.visualization.GeoChart(document.getElementById('chart_div'));
chart.draw(data, options);
};

Answer 1

Try this NOT TESTED
function drawMarkersMap() {
var data = new google.visualization.DataTable();
data.addColumn('string', 'City');
data.addColumn('number', 'Population');
data.addRows([
['Rome', 2761477],
['Milan', 1324110],
['Naples', 959574],
['Turin', 907563],
['Palermo', 655875],
['Genoa', 607906],
['Bologna', 380181],
['Florence', 371282]
]);
var data1 = new google.visualization.DataTable();
data.addColumn('string', 'City');
data.addColumn('number', 'Area');
data.addRows([
['Rome', 1285.31],
['Milan', 181.76],
['Naples', 117.27],
['Turin', 130.17],
['Palermo', 158.9],
['Genoa', 243.60],
['Bologna', 140.7],
['Florence', 102.41]
]);
var options = {
region: 'IT',
displayMode: 'markers',
colorAxis: {colors: ['green', 'blue']}
};
if(condition1){
var chart = new google.visualization.GeoChart(document.getElementById('chart_div'));
chart.draw(data, options);
} else{
var chart = new google.visualization.GeoChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
};

Answer 2

Have a look at my answer to another similar question here. It's a matter of applying a pattern formatter and then creating a separate view for the data.