A simple example, all I'm doing here is reloading the graphs when the tabs show event gets fired for each tab. I'm sure there's a more elegant solution but it does the job.
$("a[href='#A']").on('shown.bs.tab', function (e) {
google.load('visualization', '1', {
packages: ['timeline'],
callback: drawChartA
});
});
$("a[href='#B']").on('shown.bs.tab', function (e) {
google.load('visualization', '1', {
packages: ['timeline'],
callback: drawChartB
});
});
$("a[href='#C']").on('shown.bs.tab', function (e) {
google.load('visualization', '1', {
packages: ['timeline'],
callback: drawChartC
});
});