Getting onTap input into a Ui.WatchFace

Is it possible to get tap input for a Ui.WatchFace?

I'm initialising with:

function getInitialView()
{
return [new RightTextWatchView(), new RightTextWatchDelegate()];
}

With:

class RightTextWatchDelegate extends Ui.InputDelegate
{
...
}

class RightTextWatchView extends Ui.WatchFace
{
...
}

But no amount of tapping in the emulator registers anything?

Thanks

Alan