MahApps/MahApps.Metro — pull request #855 by Amrykid (2013-12-06 14:49:19+00:00)
Title: Allow MetroWindows from code, no glowing border, however.

Due to a limitation with Windows' windowing system, we can not change AllowsTransparency after a window has loaded. Fixes #853

This is a temporary fix. We may need to rework the glowing border effect in the future.