The Header features a dedicated Back button to support "drill down" navigation. The buttons appear when you pass a callback function to the backbutton method.

ts.ui.Header.backbutton(function onclick() {
	ts.ui.Notification.success('Go back!');
});

You should of course not forget to hook your navigation up to the browsers native Back button. If and when needed, you can of course also display a Forward button.

ts.ui.Header.forwardbutton(function onclick() {
	ts.ui.Notification.success('Go forward!');
});

Once the navigation is completed, you can hide the buttons again by passing null as an argument.

ts.ui.Header.backbutton(null).forwardbutton(null);

Here' an overview of the Navigation methods.