public SimpleWorkflow AddStep(ISimpleActivity workflowStep)
 {
     if (_root == null)
     {
         _root = workflowStep;
     }
     else
     {
         _root.AddStep(workflowStep);
     }
     return(this);
 }
 public void AddStep(ISimpleActivity workflowStep)
 {
     _subsequentStep = workflowStep;
 }