Пытаюсь избавиться от ошибки, откатившись
Revert "LostWindow"

This reverts commit 7ff8c521ee89874ae22885c2ba5cb21e35567de4.

Conflicts:
	TeamProjectTetris/TeamProjectTetris/LostWindow.xaml.cs
Merge remote-tracking branch 'origin/master'

Conflicts:
	TeamProjectTetris/TeamProjectTetris.v11.suo
	TeamProjectTetris/TeamProjectTetris/LostWindow.xaml.cs