CodeBehind

#region ChangeTheme
            public void ChangeTheme(string theme)
            {
                App.Current.Dispatcher.Invoke(() => {
                    var tempTheme = ThemeManager.DetectAppStyle(Application.Current);
                    var appTheme = ThemeManager.GetAppTheme(theme);
                    ThemeManager.ChangeAppStyle(Application.Current, tempTheme.Item2, appTheme);
                });
            }
            #endregion
            #region ChangeAccent
            public void ChangeAccent(string accent)
            {
                App.Current.Dispatcher.Invoke(() => {
                    var tempTheme = ThemeManager.DetectAppStyle(Application.Current);
                    var tempAccent = ThemeManager.GetAccent(accent);
                    ThemeManager.ChangeAppStyle(Application.Current, tempAccent, tempTheme.Item1);
                });
            }
            #endregion