void SetTheme(GameTheme newTheme)
 {
     switch (newTheme)
     {
         case GameTheme.Day:
             var black = new SolidColorBrush(Colors.Black);
             BtnUndo.Foreground = BtnGotoPrevLevel.Foreground = BtnGotoNextLevel.Foreground = black;
             TxtTimer.RequestedTheme = ElementTheme.Light;
             this.BottomAppBar.RequestedTheme = ElementTheme.Light;
             break;
         case GameTheme.Night:
             var white = new SolidColorBrush(Colors.White);
             BtnUndo.Foreground = BtnGotoPrevLevel.Foreground = BtnGotoNextLevel.Foreground = white;
             TxtTimer.RequestedTheme = ElementTheme.Dark;
             this.BottomAppBar.RequestedTheme = ElementTheme.Dark;
             break;
     }
 }
 void SetTheme(GameTheme newTheme)
 {
     switch (newTheme)
     {
         case GameTheme.Day:
             var black = new SolidColorBrush(Colors.Black);
             Line1.Stroke = black;
             Line2.Stroke = black;
             Line3.Stroke = black;
             UndoMove.Foreground = black;
             UndoMove.RequestedTheme = ElementTheme.Light;
             TxtTimer.RequestedTheme = ElementTheme.Light;
             break;
         case GameTheme.Night:
             var white = new SolidColorBrush(Colors.White);
             Line1.Stroke = white;
             Line2.Stroke = white;
             Line3.Stroke = white;
             UndoMove.Foreground = white;
             UndoMove.RequestedTheme = ElementTheme.Dark;
             TxtTimer.RequestedTheme = ElementTheme.Dark;
             break;
     }
 }