FindVisualChildren C# WPF

Extensions.cs

    public static IEnumerable<T> FindVisualChildren<T>(this DependencyObject depObj) where T : DependencyObject
    {
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
        {
            var child = VisualTreeHelper.GetChild(depObj, i);
            if (child is T t)
            {
                yield return t;
            }
            foreach (T childOfChild in FindVisualChildren<T>(child))
            {
                yield return childOfChild;
            }
        }
    }