ensure open dialog event is called. fix #123

Author: ButchersBoy

MainDemo.Wpf/Domain/DialogsViewModel.cs

@@ -57,12 +57,17 @@ private async void ExecuteRunExtendedDialog(object o)
             };
 
             //show the dialog
-            var result = await DialogHost.Show(view, "RootDialog", ExtendedClosingEventHandler);
+            var result = await DialogHost.Show(view, "RootDialog", ExtendedOpenedEventHandler, ExtendedClosingEventHandler);
 
             //check the result...
             Console.WriteLine("Dialog was closed, the CommandParameter used to close it was: " + (result ?? "NULL"));
         }
 
+        private void ExtendedOpenedEventHandler(object sender, DialogOpenedEventArgs eventargs)
+        {
+            Console.WriteLine("You could intercept the open and affect the dialog using eventArgs.Session.");
+        }
+
         private void ExtendedClosingEventHandler(object sender, DialogClosingEventArgs eventArgs)
         {
             if ((bool)eventArgs.Parameter == false) return;

MaterialDesignThemes.Wpf/DialogHost.cs

@@ -156,9 +156,9 @@ public static async Task<object> Show(object content, object dialogIndetifier, D
 
             targets[0].AssertTargetableContent();
             targets[0].DialogContent = content;
-            targets[0].SetCurrentValue(IsOpenProperty, true);
             targets[0]._asyncShowOpenedEventHandler = openedEventHandler;
             targets[0]._asyncShowClosingEventHandler = closingEventHandler;
+            targets[0].SetCurrentValue(IsOpenProperty, true);
 
             var task = new Task(() =>
             {