public void SaveSettings(IAppConfiguration configs)
{
foreach (var item in this.Items)
{
if (this.ItemContainerGenerator.ContainerFromItem(item) is DependencyObject container)
{
var dataContext = container.GetValue(DataContextProperty);
if (dataContext != null)
{
configs.SetValue(typeof(BrowserItemsControl), dataContext.GetType(), nameof(ModernExpander.IsExpanded), GetIsExpanded(container));
}
}
}
}