public void actAdd(Object o)
        {
            proposition proposition = new proposition();
            proposition.program = this.program;

            request.propositions.Add(proposition);

            db.SaveChanges();
            mediator.NotifyViewModel(Helper.Event.ADD_PROPOSITION,proposition);

            this.CloseActionAdd();
        }
 public void actDeleteProposition(proposition proposition)
 {
     db.propositions.Remove(proposition);
     propositions.Remove(proposition);
     NotifyPropertyChanged("propositions");
 }