Invalidates mesure at modification

BookAStar/BookAStar/Pages/EditBillingLinePage.xaml.cs

@@ -4,7 +4,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
-
+using System.Windows.Input;
 using Xamarin.Forms;
 
 namespace BookAStar.Pages
@@ -15,6 +15,7 @@ namespace BookAStar.Pages
         {
             InitializeComponent();
             BindingContext = model;
+            InvalidateMeasure();
         }
     }
 }