public void SetBackIndex(int index)
        {
            Index     = index;
            Direction = StepExecutionDirection.Back;

            Messenger.Default.Send(new BackStepMessage()
            {
                Index = index
            });
        }
 public void SetFarwardIndex(int index)
 {
     Index     = index;
     Direction = StepExecutionDirection.Farward;
 }