MahApps/MahApps.Metro — pull request #887 by Dotnetifier (2013-12-23 15:18:56+00:00)
Title: Added appbar_more_horizontal/vertical

Added two icons to Icons.xaml: appbar_more_vertical and appbar_more_horizontal
appbar_more_vertical are three vertical dots, appbar_more_horizontal are three horizontal dots.
Using the {DynamicResource BlackBrush}.

The icons can be used for an overflow indication.