Datepicker should be usable without an input field.

In its current form the datepicker has been implemented very awkwardly; the dialog window seems to have been implemented together with an input field. So when you tap the input field the date picker opens up. For the user it may not be very intuitive that tapping an input field will cause a date picker to pop up.

I'm trying to make the DatePicker appear using a custom button but I am finding this very difficult and I have had to resort to some dirty hacks to achieve this.

I propose that we expose the DatePickerDialog element to increase the flexibility of the date picker with very little additional effort.

[gchudnov]

Sorry for bringing up the old issue.

Is there any reason the initial state for open is false?

It would be great to open the DatePickerDialog declaratively, e.g. using the props.open property. It looks the author of the code considered that but it wasn't implemented.