AvalonStudio.Shell.Commands.UndoCommandDefinition.UndoCommandDefinition C# (CSharp) Method

		public UndoCommandDefinition()
		{
			_command = ReactiveCommand.Create();

			_command.Subscribe(_ =>
			{
				var shell = IoC.Get<IShell>();

                (shell.SelectedDocument as EditorViewModel)?.Undo();
			});
		}