private IEnumerator <Tarea> GetEnumerator()
{
for (int i = 0; i < ListasHerencia.Count; i++)
{
foreach (Tarea tarea in (IEnumerable <Tarea>)ListasHerencia.GetValueAt(i))
{
if (!TareasOcultas.Contains(tarea))
{
yield return(tarea);
}
}
}
for (int i = 0; i < Tareas.Count; i++)
{
yield return(Tareas.GetValueAt(i));
}
}