diff --git a/Bin/net40/SunnyUI.Demo.exe b/Bin/net40/SunnyUI.Demo.exe
index 3b051494..5315c3cb 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 999f999d..322fb5b5 100644
Binary files a/Bin/net40/SunnyUI.dll and b/Bin/net40/SunnyUI.dll differ
diff --git a/Bin/net45/SunnyUI.dll b/Bin/net45/SunnyUI.dll
index a048229d..0e95eb56 100644
Binary files a/Bin/net45/SunnyUI.dll and b/Bin/net45/SunnyUI.dll differ
diff --git a/Bin/net5.0-windows/SunnyUI.dll b/Bin/net5.0-windows/SunnyUI.dll
index 302ea4f3..52b85e54 100644
Binary files a/Bin/net5.0-windows/SunnyUI.dll and b/Bin/net5.0-windows/SunnyUI.dll differ
diff --git a/Bin/netcoreapp3.1/SunnyUI.dll b/Bin/netcoreapp3.1/SunnyUI.dll
index 8f1d4217..511ca791 100644
Binary files a/Bin/netcoreapp3.1/SunnyUI.dll and b/Bin/netcoreapp3.1/SunnyUI.dll differ
diff --git a/SunnyUI/Controls/UIComboBox.cs b/SunnyUI/Controls/UIComboBox.cs
index 70d92c92..fdb5842c 100644
--- a/SunnyUI/Controls/UIComboBox.cs
+++ b/SunnyUI/Controls/UIComboBox.cs
@@ -84,12 +84,14 @@ namespace Sunny.UI
 
         protected override void ItemForm_ValueChanged(object sender, object value)
         {
-            if (SelectedIndex != ListBox.SelectedIndex)
-            {
-                SelectedIndex = ListBox.SelectedIndex;
-                //Box_SelectedIndexChanged(null, null);
-                Invalidate();
-            }
+            //if (SelectedIndex != ListBox.SelectedIndex)
+            //{
+            //    SelectedIndex = ListBox.SelectedIndex;
+            //    //Box_SelectedIndexChanged(null, null);
+            //    Invalidate();
+            //}
+
+            Invalidate();
         }
 
         private readonly UIComboBoxItem dropForm = new UIComboBoxItem();