[gtkmm] Date Entry / Edit widget?

[erik_ohrnberger dme net]

I Fired up glade-2 (version 1.1.3) and noticed that there is a basic data
entry / edit widget.  I want to use this widget in my gtkmm-2.4 program.  

Where would it be so that I can include it?

Is there additional documentation for this widget, so I can read up on how
to use it?

	Thanks,
		Erik.