diff --git a/SunnyUI/Controls/UIComboBox.cs b/SunnyUI/Controls/UIComboBox.cs
index 38a1d3a3..84cee751 100644
--- a/SunnyUI/Controls/UIComboBox.cs
+++ b/SunnyUI/Controls/UIComboBox.cs
@@ -689,7 +689,6 @@ namespace Sunny.UI
 
         [Description("获取或设置指示显示值的方式的格式说明符字符。"), Category("SunnyUI")]
         [DefaultValue("")]
-        [Editor("System.Windows.Forms.Design.FormatStringEditor, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor))]
         [MergableProperty(false)]
         public string FormatString
         {