void IAddModifyViewForm.Add(IDTO pNewSlide)
 {
     this.txtDuration.Text = String.Empty;
     //transicion
     this.Text = "Agregar nuevo Slide";
     this.iOriginalSlide = (SlideDTO)pNewSlide;
 }
 void IAddModifyViewForm.Modify(IDTO pSlide)
 {
     if (pSlide == null)
     {
         throw new ArgumentNullException();
         //TODO excepcion argumentexception creo
     }
     else
     {
         this.iOriginalSlide = (SlideDTO)pSlide;
         this.txtDuration.Text = iOriginalSlide.Duration.ToString();
         this.Text = "Modificar Slide";
     }
 }