diff --git a/Disp/DemoStl.cs b/Disp/DemoStl.cs
index 25dc1b3..14de6c0 100644
--- a/Disp/DemoStl.cs
+++ b/Disp/DemoStl.cs
@@ -1,6 +1,7 @@
-using Hi.Geom;
+using Hi.Disp;
+using Hi.Geom;
+using Hi.WpfPlus.Disp;
 using System;
-using Hi.Disp;
 
 namespace Sample.Disp
 {
@@ -41,7 +42,7 @@ namespace Sample.Disp
 			Console.WriteLine("bouindingbox.Min: " + bouindingbox.Min);
 			Console.WriteLine("bouindingbox.Max: " + bouindingbox.Max);
 			Console.WriteLine("bouindingbox.Center: " + bouindingbox.Center);
-			DispUtil.CallRenderingFrame("DemoForm", stl.ToFaceDrawing());
+			DispFrameUtil.Call("DemoForm", stl.ToFaceDrawing());
 			#endregion
 		}
 
diff --git a/Disp/DemoUtil.cs b/Disp/DemoUtil.cs
index 9a90e75..4ec0391 100644
--- a/Disp/DemoUtil.cs
+++ b/Disp/DemoUtil.cs
@@ -4,39 +4,38 @@ using Hi.Licenses;
 using Hi.WpfPlus.Disp;
 using System.Windows;
 
-namespace Sample.Disp
+namespace Sample.Disp;
+
+/// <summary>
+/// Provides utility functions for running HiAPI display examples in a WPF environment.
+/// Contains helper methods that simplify the setup and execution of WPF applications with HiAPI rendering.
+/// Handles common initialization and cleanup tasks for visualization examples.
+/// </summary>
+/// <remarks>
+/// ### Source Code
+/// [!code-csharp[SampleCode](~/../Hi.Sample.Wpf/Disp/DemoUtil.cs)]
+/// </remarks>
+public static class DemoUtil
 {
-    /// <summary>
-    /// Provides utility functions for running HiAPI display examples in a WPF environment.
-    /// Contains helper methods that simplify the setup and execution of WPF applications with HiAPI rendering.
-    /// Handles common initialization and cleanup tasks for visualization examples.
-    /// </summary>
-    /// <remarks>
-    /// ### Source Code
-    /// [!code-csharp[SampleCode](~/../Hi.Sample.Wpf/Disp/DemoUtil.cs)]
-    /// </remarks>
-    public static class DemoUtil
-    {
-        /// <summary>
-        /// Creates and runs a WPF application with a RenderingWindow to display 3D content.
-        /// Handles proper initialization and cleanup of HiAPI resources including MongoDB server,
-        /// display engine, and licensing.
-        /// </summary>
-        /// <param name="title">The title for the application window</param>
-        /// <param name="displayee">The object that implements IDisplayee to be rendered</param>
-        public static void RunApplication(string title, IDisplayee displayee)
-        {
-            LocalApp.AppBegin();
-            Application app = new Application();
-            app.Exit += (o, e) =>
-            {
-                LocalApp.AppEnd();
-            };
-            app.Run(new RenderingWindow()
-            {
-                Title = title,
-                Displayee = displayee
-            });
-        }
-    }
+	/// <summary>
+	/// Creates and runs a WPF application with a RenderingWindow to display 3D content.
+	/// Handles proper initialization and cleanup of HiAPI resources including MongoDB server,
+	/// display engine, and licensing.
+	/// </summary>
+	/// <param name="title">The title for the application window</param>
+	/// <param name="displayee">The object that implements IDisplayee to be rendered</param>
+	public static void RunApplication(string title, IDisplayee displayee)
+	{
+		LocalApp.AppBegin();
+		Application app = new Application();
+		app.Exit += (o, e) =>
+		{
+			LocalApp.AppEnd();
+		};
+		app.Run(new RenderingWindow()
+		{
+			Title = title,
+			Displayee = displayee
+		});
+	}
 }