From ac4fef073ef0ec79cc59709def86bfbb35c71e26 Mon Sep 17 00:00:00 2001
From: Sunny <yhuse@163.com>
Date: Tue, 21 Jun 2022 18:00:55 +0800
Subject: [PATCH] =?UTF-8?q?*=20UIDropDown:=20=E8=A7=A3=E5=86=B3=E4=B8=8B?=
 =?UTF-8?q?=E6=8B=89=E6=8E=A7=E4=BB=B6=E5=85=B3=E9=97=AD=E6=8A=A5=E9=94=99?=
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---
 SunnyUI/Controls/DropItem/UIDropControl.cs | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/SunnyUI/Controls/DropItem/UIDropControl.cs b/SunnyUI/Controls/DropItem/UIDropControl.cs
index 347f8492..8bb94031 100644
--- a/SunnyUI/Controls/DropItem/UIDropControl.cs
+++ b/SunnyUI/Controls/DropItem/UIDropControl.cs
@@ -160,7 +160,17 @@ namespace Sunny.UI
 
                 return itemForm;
             }
-            set => itemForm = value;
+            set
+            {
+                itemForm = value;
+
+                if (itemForm != null)
+                {
+                    itemForm.ValueChanged += ItemForm_ValueChanged;
+                    itemForm.VisibleChanged += ItemForm_VisibleChanged;
+                    itemForm.Closed += ItemForm_Closed;
+                }
+            }
         }
 
         private void ItemForm_Closed(object sender, ToolStripDropDownClosedEventArgs e)