private void categories_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
{
var sample = ((e.NewValue as TreeViewItem).DataContext as SampleModel);
if (sample == null)
{
var category = ((e.NewValue as TreeViewItem).DataContext as CategoryModel);
var subcategories = category.SubCategories;
var samples = new List<SampleModel>();
foreach (var subCategory in subcategories)
{
if (subCategory.Samples.Count > 0)
samples.AddRange(subCategory.Samples);
}
if (samples.Any())
{
categoriesList.ItemsSource = samples;
CategoriesRegion.Visibility = Visibility.Visible;
}
}
else
SelectSample(sample);
}