[visualization-api] Gantt Tooltips - How to customize?

[Curt Christianson]

I've added the column to the data:

var data = new google.visualization.DataTable();

data.addColumn('string', 'Task ID');

data.addColumn('string', 'Task Name');

data.addColumn('string', 'Resource');

data.addColumn('date', 'Start Date');

data.addColumn('date', 'End Date');

data.addColumn('number', 'Duration');

data.addColumn('number', 'Percent Complete');

data.addColumn('string', 'Dependencies');

* data.addColumn({type: 'string', role: 'tooltip'});*


I've added the extra data in the data.addRows([

['1', 'Title here', "Res", new Date(2016, 7, 2), new Date(2016, 10, 2),
0, 100, null, 'tooltip here']

]);


I've added it to the options:

var options = {

*tooltip: {isHtml: true)*

};


But I can't get anything but the default tooltip. I would like to remove
existing items from the tooltip and add custom items. What am I missing?