public OwnedStockDetailsPage(OwnedStock ownedStock) { OwnedStock = ownedStock; OwnedStock.UpdateOwnedAsset(); BindingContext = this; InitializeComponent(); editNumOfShares = new SfNumericTextBox { Value = 0 }; editNumOfShares.ValueChanged += Handle_NumSharesChanged; editPurchasePrice = new SfNumericTextBox { Value = 0 }; editPurchasePrice.ValueChanged += Handle_PriceChanged; editReturnGoal = new SfNumericTextBox { Value = 0 }; editReturnGoal.ValueChanged += Handle_ReturnGoalChanged; }