Tk::PopEntry is a derived widget, based on Tk::Entry.
It includes a pop-up menu that appears automatically when
a user right-clicks on the Entry widget. There are five
default options: Cut, Copy, Paste, Delete and Sel. All.
There are also input mask options that can be used to limit
the types of data that a user may enter.
See the POD documentation for a full description
of this module.