Add RenewContext

Elwig/Windows/AreaComAdminWindow.xaml.cs

@@ -39,6 +39,10 @@ namespace Elwig.Windows {
             CultInput.ItemsSource = Context.WineCultivations.OrderBy(c => c.Name).ToList();
         }
 
+        protected override async Task RenewContext() {
+            await base.RenewContext();
+        }
+
         private async Task RefreshContractList() {
             /*
             await Context.Contracts.LoadAsync();