A method which returns all elements included in passed element

gistfile1.cs

static IEnumerable<System.Windows.DependencyObject> EnumurateAllElement(System.Windows.DependencyObject root)
{
    yield return root;
    foreach (var element in GetChilren(root).SelectMany(ele => EnumurateAllElement(ele)))
    {
        yield return element;
    }
}

static IEnumerable<System.Windows.DependencyObject> GetChilren(System.Windows.DependencyObject root)
{
    for (int i = 0; i < System.Windows.Media.VisualTreeHelper.GetChildrenCount(root); i++)
    {
        yield return System.Windows.Media.VisualTreeHelper.GetChild(root, i);
    }
}

IEnumerableは正義。