diff --git a/src/Lemon.ModuleNavigation.Avaloniaui/Dialogs/AvaDialogService.cs b/src/Lemon.ModuleNavigation.Avaloniaui/Dialogs/AvaDialogService.cs
index 4084b7e..626cb81 100644
--- a/src/Lemon.ModuleNavigation.Avaloniaui/Dialogs/AvaDialogService.cs
+++ b/src/Lemon.ModuleNavigation.Avaloniaui/Dialogs/AvaDialogService.cs
@@ -17,7 +17,7 @@ public void Show(string name,
             IDialogParameters? parameters = null,
             Action<IDialogResult>? callback = null)
         {
-            ShowCore(name, null, false, parameters, callback);
+            ShowCore(name, null, false, parameters, callback).Wait();
         }
 
         public void Show(string name,
@@ -25,25 +25,25 @@ public void Show(string name,
             IDialogParameters? parameters = null, 
             Action<IDialogResult>? callback = null)
         {
-            ShowCore(name, windowName, false, parameters, callback);
+            ShowCore(name, windowName, false, parameters, callback).Wait();
         }
 
-        public void ShowDialog(string name,
+        public async Task ShowDialog(string name,
             IDialogParameters? parameters = null, 
             Action<IDialogResult>? callback = null)
         {
-            ShowCore(name, null, true, parameters, callback);
+            await ShowCore(name, null, true, parameters, callback);
         }
 
-        public void ShowDialog(string name, 
+        public async Task ShowDialog(string name, 
             string windowName,
             IDialogParameters? parameters = null,
             Action<IDialogResult>? callback = null)
         {
-            ShowCore(name, windowName, true, parameters, callback);
+            await ShowCore(name, windowName, true, parameters, callback);
         }
 
-        private void ShowCore(string name,
+        private async Task ShowCore(string name,
             string? windowName,
             bool showDialog,
             IDialogParameters? parameters = null,
@@ -66,8 +66,8 @@ private void ShowCore(string name,
             dialogViewModel.OnDialogOpened(parameters);
             dialogViewModel.RequestClose += (result) =>
             {
-                dialogWindow.Close();
                 callback?.Invoke(result);
+                dialogWindow.Close();
             };
             dialogWindow.Closed += (s, e) =>
             {
@@ -78,8 +78,7 @@ private void ShowCore(string name,
                 if (Application.Current!.ApplicationLifetime is IClassicDesktopStyleApplicationLifetime classicDesktop)
                 {
                     var owner = classicDesktop.MainWindow!;
-                    // todo
-                    dialogWindow.ShowDialog(owner);
+                    await dialogWindow.ShowDialog(owner);
                 }
             }
             else
diff --git a/src/Lemon.ModuleNavigation.Sample/ViewModels/MainViewModel.cs b/src/Lemon.ModuleNavigation.Sample/ViewModels/MainViewModel.cs
index e11013e..a2ea545 100644
--- a/src/Lemon.ModuleNavigation.Sample/ViewModels/MainViewModel.cs
+++ b/src/Lemon.ModuleNavigation.Sample/ViewModels/MainViewModel.cs
@@ -47,7 +47,7 @@ public MainViewModel(IEnumerable<IModule> modules,
             _navigationService.RequestViewNavigation("ItemsRegion", viewName, requestNew);
             _navigationService.RequestViewNavigation("TransitioningContentRegion", viewName, requestNew);
         });
-        ToDialogCommand = ReactiveCommand.Create<string>(content =>
+        ToDialogCommand = ReactiveCommand.Create<string>(async content =>
         {
             var viewName = content;
             var showDialog = false;
@@ -63,10 +63,11 @@ public MainViewModel(IEnumerable<IModule> modules,
             };
             if (showDialog)
             {
-                _dialogService.ShowDialog(viewName, param, p =>
+                await _dialogService.ShowDialog(viewName, param, p =>
                 {
-                    _logger.LogDebug($"close call back:{p}");
+                    _logger.LogDebug($"Call back:{p}");
                 });
+                _logger.LogDebug($"ShowDialog over!");
             }
             else
             {
diff --git a/src/Lemon.ModuleNavigation/Abstracts/IDialogService.cs b/src/Lemon.ModuleNavigation/Abstracts/IDialogService.cs
index 29f9c56..ea784e3 100644
--- a/src/Lemon.ModuleNavigation/Abstracts/IDialogService.cs
+++ b/src/Lemon.ModuleNavigation/Abstracts/IDialogService.cs
@@ -11,11 +11,11 @@ void Show(string name,
             IDialogParameters? parameters = null,
             Action<IDialogResult>? callback = null);
 
-        void ShowDialog(string name,
+        Task ShowDialog(string name,
             IDialogParameters? parameters = null, 
             Action<IDialogResult>? callback = null);
 
-        void ShowDialog(string name,
+        Task ShowDialog(string name,
             string windowName,
             IDialogParameters? parameters = null,
             Action<IDialogResult>? callback = null);