diff --git a/SunnyUI/Controls/UIComboBox.Designer.cs b/SunnyUI/Controls/UIComboBox.Designer.cs
index abfe1691..f6290cd8 100644
--- a/SunnyUI/Controls/UIComboBox.Designer.cs
+++ b/SunnyUI/Controls/UIComboBox.Designer.cs
@@ -17,6 +17,8 @@
             {
                 components.Dispose();
             }
+
+            HideFilterForm();
             base.Dispose(disposing);
         }
 
diff --git a/SunnyUI/Controls/UIComboBox.cs b/SunnyUI/Controls/UIComboBox.cs
index d0979ca9..903241a1 100644
--- a/SunnyUI/Controls/UIComboBox.cs
+++ b/SunnyUI/Controls/UIComboBox.cs
@@ -79,6 +79,12 @@ namespace Sunny.UI
             if (Text.IsNullOrEmpty() && ShowFilter)
                 FillFilterTextEmpty();
 
+            foreach (var item in Parent.GetControls<UIComboBox>())
+            {
+                if (!item.Equals(this))
+                    item.HideFilterForm();
+            }
+
             FilterItemForm.AutoClose = false;
             if (!FilterItemForm.Visible)
             {
diff --git a/SunnyUI/Frames/UIPage.cs b/SunnyUI/Frames/UIPage.cs
index 4f892dc2..bdd6c242 100644
--- a/SunnyUI/Frames/UIPage.cs
+++ b/SunnyUI/Frames/UIPage.cs
@@ -473,6 +473,11 @@ namespace Sunny.UI
         public virtual void Final()
         {
             Finalize?.Invoke(this, new EventArgs());
+
+            foreach (var item in this.GetControls<UIComboBox>(true))
+            {
+                item.HideFilterForm();
+            }
         }
 
         public void SetStyle(UIStyle style)