public void NewList(object sender, RoutedEventArgs args)
{
Background = new SolidColorBrush(Color.FromRgb(0, 200, 200));
label = new TextBox();
label.FontFamily = font;
container = new ListContainer();
label.Text = "NewToDoList";
label.Background = new SolidColorBrush(Color.FromRgb(0, 200, 200));
label.BorderThickness = new Thickness(0);
AllowDrop = true;
button_add = new Button();
button_add.HorizontalAlignment = HorizontalAlignment.Stretch;
button_add.VerticalAlignment = VerticalAlignment.Bottom;
button_add.BorderThickness = new Thickness(0);
button_add.Background = new SolidColorBrush(accent);
button_add.Content = "Add";
button_add.Click += b_Add;
button_add.FontFamily = font;
GridContent.Height = container.Height;
GridContent.Children.Add(label);
GridContent.Children.Add(container);
GridContent.Children.Add(button_add);
GridContent.UpdateLayout();
ThemeManager_IsThemeChanged(null, null);
}