diff --git a/Bin/SunnyUI.Demo.exe b/Bin/SunnyUI.Demo.exe
index eed40046..6367bfab 100644
Binary files a/Bin/SunnyUI.Demo.exe and b/Bin/SunnyUI.Demo.exe differ
diff --git a/Bin/SunnyUI.dll b/Bin/SunnyUI.dll
index 39a1d408..94677090 100644
Binary files a/Bin/SunnyUI.dll and b/Bin/SunnyUI.dll differ
diff --git a/SunnyUI.Demo/Controls/FCombobox.Designer.cs b/SunnyUI.Demo/Controls/FCombobox.Designer.cs
index 7cc8b0f8..41377f73 100644
--- a/SunnyUI.Demo/Controls/FCombobox.Designer.cs
+++ b/SunnyUI.Demo/Controls/FCombobox.Designer.cs
@@ -100,7 +100,6 @@
             this.uiColorPicker1.TabIndex = 40;
             this.uiColorPicker1.Text = "uiColorPicker1";
             this.uiColorPicker1.TextAlignment = System.Drawing.ContentAlignment.MiddleLeft;
-            this.uiColorPicker1.Value = System.Drawing.Color.FromArgb(((int)(((byte)(80)))), ((int)(((byte)(159)))), ((int)(((byte)(254)))));
             // 
             // uiLine7
             // 
@@ -225,6 +224,7 @@
             this.uiComboBox1.TabIndex = 32;
             this.uiComboBox1.TextAlignment = System.Drawing.ContentAlignment.MiddleLeft;
             this.uiComboBox1.Watermark = "水印文字";
+            this.uiComboBox1.DropDown += new System.EventHandler(this.uiComboBox1_DropDown);
             // 
             // FCombobox
             // 
diff --git a/SunnyUI.Demo/Controls/FCombobox.cs b/SunnyUI.Demo/Controls/FCombobox.cs
index e4df333c..ff317177 100644
--- a/SunnyUI.Demo/Controls/FCombobox.cs
+++ b/SunnyUI.Demo/Controls/FCombobox.cs
@@ -23,5 +23,14 @@ namespace Sunny.UI.Demo
         {
             uiTimePicker1.Value.ConsoleWriteLine();
         }
+
+        private void uiComboBox1_DropDown(object sender, EventArgs e)
+        {
+            uiComboBox1.Items.Clear();
+            uiComboBox1.Items.Add("100");
+            uiComboBox1.Items.Add("101");
+            uiComboBox1.Items.Add("102");
+            uiComboBox1.Items.Add("103");
+        }
     }
 }
diff --git a/SunnyUI/Controls/DropItem/UIDropControl.cs b/SunnyUI/Controls/DropItem/UIDropControl.cs
index a9bd1cf1..66e425ab 100644
--- a/SunnyUI/Controls/DropItem/UIDropControl.cs
+++ b/SunnyUI/Controls/DropItem/UIDropControl.cs
@@ -127,6 +127,7 @@ namespace Sunny.UI
                     {
                         itemForm.ValueChanged += ItemForm_ValueChanged;
                         itemForm.VisibleChanged += ItemForm_VisibleChanged;
+                        itemForm.Closed += ItemForm_Closed;
                     }
                 }
 
@@ -135,6 +136,11 @@ namespace Sunny.UI
             set => itemForm = value;
         }
 
+        private void ItemForm_Closed(object sender, ToolStripDropDownClosedEventArgs e)
+        {
+            DropDownClosed?.Invoke(this, null);
+        }
+
         private void ItemForm_VisibleChanged(object sender, EventArgs e)
         {
             dropSymbol = SymbolNormal;
@@ -363,13 +369,14 @@ namespace Sunny.UI
                     ItemForm.SetStyle(UIStyles.ActiveStyleColor);
                 }
 
+                DropDown?.Invoke(this, e);
                 ButtonClick?.Invoke(this, e);
             }
         }
 
-        //public event EventHandler DropDown;
+        public event EventHandler DropDown;
 
-        //public event EventHandler DropDownClosed;
+        public event EventHandler DropDownClosed;
 
         public void Select(int start, int length)
         {