FindVisualChild

public static List<T> FindVisualChild<T>(DependencyObject obj) where T : DependencyObject
        {
            try
            {
                List<T> TList = new List<T> { };
                for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
                {
                    DependencyObject child = VisualTreeHelper.GetChild(obj, i);
                    if (child != null && child is T)
                    {
                        TList.Add((T)child);
                        List<T> childOfChildren = FindVisualChild<T>(child);
                        if (childOfChildren != null)
                        {
                            TList.AddRange(childOfChildren);
                        }
                    }
                    else
                    {
                        List<T> childOfChildren = FindVisualChild<T>(child);
                        if (childOfChildren != null)
                        {
                            TList.AddRange(childOfChildren);
                        }
                    }
                }
                return TList;
            }
            catch (Exception ee)
            {
            }
        }