diff --git a/Bin/net40/SunnyUI.Demo.exe b/Bin/net40/SunnyUI.Demo.exe
index ee06ac97..d7f74301 100644
Binary files a/Bin/net40/SunnyUI.Demo.exe and b/Bin/net40/SunnyUI.Demo.exe differ
diff --git a/Bin/net40/SunnyUI.dll b/Bin/net40/SunnyUI.dll
index 36d41f0e..6d84b297 100644
Binary files a/Bin/net40/SunnyUI.dll and b/Bin/net40/SunnyUI.dll differ
diff --git a/Bin/net5.0-windows/SunnyUI.dll b/Bin/net5.0-windows/SunnyUI.dll
index 76bce062..cb97d34f 100644
Binary files a/Bin/net5.0-windows/SunnyUI.dll and b/Bin/net5.0-windows/SunnyUI.dll differ
diff --git a/Bin/net5.0-windows/ref/SunnyUI.dll b/Bin/net5.0-windows/ref/SunnyUI.dll
index 61875e01..89ce3631 100644
Binary files a/Bin/net5.0-windows/ref/SunnyUI.dll and b/Bin/net5.0-windows/ref/SunnyUI.dll differ
diff --git a/Bin/netcoreapp3.1/SunnyUI.dll b/Bin/netcoreapp3.1/SunnyUI.dll
index 8cd52faf..70e749e4 100644
Binary files a/Bin/netcoreapp3.1/SunnyUI.dll and b/Bin/netcoreapp3.1/SunnyUI.dll differ
diff --git a/SunnyUI/Forms/UIFormHelper.cs b/SunnyUI/Forms/UIFormHelper.cs
index 42b885e4..95015e7b 100644
--- a/SunnyUI/Forms/UIFormHelper.cs
+++ b/SunnyUI/Forms/UIFormHelper.cs
@@ -599,4 +599,9 @@ namespace Sunny.UI
             return new UIEditForm(option);
         }
     }
+
+    public interface IFrame
+    {
+        void SelectPage(int pageIndex);
+    }
 }
\ No newline at end of file
diff --git a/SunnyUI/Frames/UIMainFrame.cs b/SunnyUI/Frames/UIMainFrame.cs
index 9c728306..02d56a52 100644
--- a/SunnyUI/Frames/UIMainFrame.cs
+++ b/SunnyUI/Frames/UIMainFrame.cs
@@ -26,7 +26,7 @@ using System.Windows.Forms;
 
 namespace Sunny.UI
 {
-    public partial class UIMainFrame : UIForm
+    public partial class UIMainFrame : UIForm, IFrame
     {
         public UIMainFrame()
         {
diff --git a/SunnyUI/Pages/UIPage.cs b/SunnyUI/Pages/UIPage.cs
index 7b7ed544..735903f4 100644
--- a/SunnyUI/Pages/UIPage.cs
+++ b/SunnyUI/Pages/UIPage.cs
@@ -39,7 +39,7 @@ namespace Sunny.UI
 
         protected UIStyle _style = UIStyle.Blue;
 
-        public UIMainFrame Frame;
+        public IFrame Frame { get; set; }
 
         public UIPage()
         {