public DescuentoEspecialViewModel() { this.PropertyChanged += DescuentoEspecialViewModel_PropertyChanged; if (!this.IsInDesignMode) { _proxy = CommonServiceLocator.ServiceLocator.Current.GetInstance <Common.ServiceContracts.IDataServiceAsync>(); this.Items = _proxy.GetDescuentoAdicionals(); } if (this.IsInDesignMode) { this.Descripcion = "desc"; this.Items = new Common.Entities.DescuentoAdicional[] { new Common.Entities.DescuentoAdicional { Id = 1, Descripcion = "r1", Descuento = .1m }, new Common.Entities.DescuentoAdicional { Id = 2, Descripcion = "r2", Descuento = .2m } }; this.SelectedItem = this.Items.First(); } }