The :class:`!tkinter.filedialog.FileDialog` dialog and its
:class:`!tkinter.filedialog.LoadFileDialog` and
:class:`!tkinter.filedialog.SaveFileDialog` subclasses, which follow the layout
of the classic Motif file selection dialog, were modernized to match its look
and feel more closely.
They are now built from the themed :mod:`tkinter.ttk` widgets instead of the
classic :mod:`tkinter` widgets, and gained a *use_ttk* parameter that selects
between the classic Tk widgets and the themed ttk widgets.
The buttons and field labels gained :kbd:`Alt` key accelerators, the default
ring follows the keyboard focus, and the :kbd:`Escape` key cancels the dialog.
The directory and file lists gained a horizontal scrollbar and type-ahead
selection.
The dialog is now centered over its parent, and the overwrite confirmation of
:class:`!SaveFileDialog` uses a themed message box.
