diff --git a/Test/TestEvaCommand.cs b/Test/TestEvaCommand.cs
index 8d0d1a3..f316d37 100644
--- a/Test/TestEvaCommand.cs
+++ b/Test/TestEvaCommand.cs
@@ -13,9 +13,9 @@ public class TestEvaCommand  : IExternalCommand
     public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
     {
         MessageBox.Show("TestEvaCommand");
-        double plus = DependLib.Plus();
-        Console.WriteLine(plus);
-        MessageBox.Show(plus.ToString());
+        // string? value = DependLib.ShowDialogFolder();
+        // Console.WriteLine(value);
+        // MessageBox.Show(value.ToString());
         return Result.Succeeded;
     }
 }
\ No newline at end of file
diff --git a/Test2/DependLib.cs b/Test2/DependLib.cs
index c35de48..72c2a69 100644
--- a/Test2/DependLib.cs
+++ b/Test2/DependLib.cs
@@ -4,7 +4,21 @@ public static class DependLib
     {
         public static double Plus()
         {
-            return 2 + 6;
+            return 2 + 10;
+        }
+
+        public static string? ShowDialogFolder()
+        {
+            //ookii-dialogs-wpf
+            var dialog = new Ookii.Dialogs.Wpf.VistaFolderBrowserDialog();
+            dialog.Description = "Select a folder";
+            dialog.UseDescriptionForTitle = true;
+            dialog.ShowNewFolderButton = true;
+            if (dialog.ShowDialog() == true)
+            {
+                return dialog.SelectedPath;
+            }
+            return null;
         }
     }
 }
\ No newline at end of file
diff --git a/Test2/Test2.csproj b/Test2/Test2.csproj
index bd31f52..e83341c 100644
--- a/Test2/Test2.csproj
+++ b/Test2/Test2.csproj
@@ -30,6 +30,7 @@
     <PackageReference Include="coverlet.collector" Version="3.1.0" />
     <PackageReference Include="Chuongmep.Revit.Api.RevitAPI" Version="$(RevitVersion).*" />
     <PackageReference Include="Chuongmep.Revit.Api.RevitAPIUI" Version="$(RevitVersion).*" />
+    <PackageReference Include="Ookii.Dialogs.Wpf" Version="5.0.1" />
   </ItemGroup>
   <ItemGroup>
     <Reference Include="PresentationFramework" />