public void Apply(Undoable step)
{
redos.Clear();
step.Apply();
undos.Push(step);
DiagManager.Instance.LogInfo(String.Format("Apply {0}", step));
}
public void Redo()
{
Undoable step = redos.Pop();
step.Redo();
undos.Push(step);
DiagManager.Instance.LogInfo(String.Format("Redo {0}", step));
}