private void TabItem_SelectionChanged(object sender, MouseButtonEventArgs e)
 {
     if (sender is JmWidgetTabItem originalSource && !originalSource.Equals(_selectedTabItem))
     {
         _selectedTabItem.IsSelected = false;
         _selectedTabItem            = originalSource;
         ChangePage();
     }
 }
 private void JmWindow_Loaded(object sender, RoutedEventArgs e)
 {
     TiThemeSkin.IsSelected = true;
     _selectedTabItem       = TiThemeSkin;
     ChangePage();
 }