diff --git a/Bin/SunnyUI.dll b/Bin/SunnyUI.dll
index b286be08..3e1c8f33 100644
Binary files a/Bin/SunnyUI.dll and b/Bin/SunnyUI.dll differ
diff --git a/Bin/SunnyUI.pdb b/Bin/SunnyUI.pdb
index 1cd76dcb..1a3548e4 100644
Binary files a/Bin/SunnyUI.pdb and b/Bin/SunnyUI.pdb differ
diff --git a/SunnyUI.Demo/Bin/SunnyUI.dll b/SunnyUI.Demo/Bin/SunnyUI.dll
index b286be08..3e1c8f33 100644
Binary files a/SunnyUI.Demo/Bin/SunnyUI.dll and b/SunnyUI.Demo/Bin/SunnyUI.dll differ
diff --git a/SunnyUI/Controls/UITreeView.cs b/SunnyUI/Controls/UITreeView.cs
index b4fe84f2..22645d1f 100644
--- a/SunnyUI/Controls/UITreeView.cs
+++ b/SunnyUI/Controls/UITreeView.cs
@@ -497,7 +497,6 @@ namespace Sunny.UI
             //
             view.BackColor = Color.White;
             view.BorderStyle = BorderStyle.None;
-            view.CheckBoxes = true;
             view.DrawMode = TreeViewDrawMode.OwnerDrawAll;
             view.ForeColor = Color.FromArgb(48, 48, 48);
             view.FullRowSelect = true;
diff --git a/SunnyUI/SunnyUI.csproj b/SunnyUI/SunnyUI.csproj
index c44b02f6..42b8556f 100644
--- a/SunnyUI/SunnyUI.csproj
+++ b/SunnyUI/SunnyUI.csproj
@@ -403,6 +403,7 @@
       <SubType>Component</SubType>
     </Compile>
     <Compile Include="Units\UConcurrentDoubleKeyDictionary.cs" />
+    <Compile Include="Units\UConcurrentGroupDictionary.cs" />
     <Compile Include="Units\USnowflakeID.cs" />
     <Compile Include="Units\UThunder.cs" />
     <Compile Include="Controls\UILine.cs">
diff --git a/SunnyUI/Units/UConcurrentDoubleKeyDictionary.cs b/SunnyUI/Units/UConcurrentDoubleKeyDictionary.cs
index cac88d47..397dabfc 100644
--- a/SunnyUI/Units/UConcurrentDoubleKeyDictionary.cs
+++ b/SunnyUI/Units/UConcurrentDoubleKeyDictionary.cs
@@ -11,7 +11,7 @@
  * If you use this code, please keep this note.
  * 如果您使用此代码，请保留此说明。
  ******************************************************************************
- * 文件名称: ULogFile.cs
+ * 文件名称: UConcurrentDoubleKeyDictionary.cs
  * 文件说明: 双主键线程安全字典，适用场景主键和键值都唯一，可双向查找
  * 当前版本: V2.2
  * 创建日期: 2020-08-17
diff --git a/SunnyUI/Units/UConcurrentGroupDictionary.cs b/SunnyUI/Units/UConcurrentGroupDictionary.cs
new file mode 100644
index 00000000..be653479
--- /dev/null
+++ b/SunnyUI/Units/UConcurrentGroupDictionary.cs
@@ -0,0 +1,169 @@
+/******************************************************************************
+ * SunnyUI 开源控件库、工具类库、扩展类库、多页面开发框架。
+ * CopyRight (C) 2012-2020 ShenYongHua(沈永华).
+ * QQ群：56829229 QQ：17612584 EMail：SunnyUI@qq.com
+ *
+ * Blog:   https://www.cnblogs.com/yhuse
+ * Gitee:  https://gitee.com/yhuse/SunnyUI
+ * GitHub: https://github.com/yhuse/SunnyUI
+ *
+ * SunnyUI.dll can be used for free under the GPL-3.0 license.
+ * If you use this code, please keep this note.
+ * 如果您使用此代码，请保留此说明。
+ ******************************************************************************
+ * 文件名称: UConcurrentGroupDictionary.cs
+ * 文件说明: 分组线程安全字典
+ * 当前版本: V2.2
+ * 创建日期: 2020-08-18
+ *
+ * 2020-08-18: V2.2.7 增加文件说明
+******************************************************************************/
+
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Sunny.UI
+{
+    public class ConcurrentGroupDictionary<TGroup, TKey, TValue>
+    {
+        private readonly ConcurrentDictionary<TGroup, ConcurrentDictionary<TKey, TValue>> GroupDictionary
+            = new ConcurrentDictionary<TGroup, ConcurrentDictionary<TKey, TValue>>();
+        private readonly ConcurrentDictionary<TKey, TValue> ObjectDictionary
+            = new ConcurrentDictionary<TKey, TValue>();
+
+        public ConcurrentDictionary<TKey, TValue> this[TGroup group]
+        {
+            get => ContainsGroup(group) ? GroupDictionary[group] : new ConcurrentDictionary<TKey, TValue>();
+            set
+            {
+                if (!ContainsGroup(group)) TryAdd(group);
+                GroupDictionary[group] = value;
+            }
+        }
+
+        public bool ContainsGroup(TGroup group)
+        {
+            return GroupDictionary.ContainsKey(group);
+        }
+
+        public bool ContainsKey(TKey key)
+        {
+            return ObjectDictionary.ContainsKey(key);
+        }
+
+        public bool ContainsKey(TGroup group, TKey key)
+        {
+            return ContainsGroup(group) && GroupDictionary[group].ContainsKey(key);
+        }
+
+        public void TryAdd(TGroup group)
+        {
+            if (!GroupDictionary.ContainsKey(group))
+                GroupDictionary.TryAdd(group, new ConcurrentDictionary<TKey, TValue>());
+        }
+
+        public void TryAdd(TGroup group, TKey key, TValue value)
+        {
+            TryAdd(group);
+
+            if (GroupDictionary[group].ContainsKey(key))
+                GroupDictionary[group][key] = value;
+            else
+                GroupDictionary[group].TryAdd(key, value);
+
+            if (ObjectDictionary.ContainsKey(key))
+                ObjectDictionary[key] = value;
+            else
+                ObjectDictionary.TryAdd(key, value);
+        }
+
+        public void TryRemove(TGroup group, TKey key, TValue value)
+        {
+            if (GroupDictionary.ContainsKey(group))
+            {
+                if (GroupDictionary[group].ContainsKey(key)) GroupDictionary[group].TryRemove(key, out _);
+                if (GroupDictionary[group].Count == 0) GroupDictionary.TryRemove(group, out _);
+            }
+
+            if (ObjectDictionary.ContainsKey(key))
+            {
+                ObjectDictionary.TryRemove(key, out _);
+            }
+        }
+
+        public void ClearAll()
+        {
+            List<TGroup> groups = GroupDictionary.Keys.ToList();
+            foreach (var group in groups)
+            {
+                ClearGroup(group);
+            }
+
+            GroupDictionary.Clear();
+            ObjectDictionary.Clear();
+        }
+
+        public void ClearGroup(TGroup group)
+        {
+            if (GroupDictionary.ContainsKey(group))
+            {
+                List<TKey> keys = GroupDictionary[group].Keys.ToList();
+                foreach (var key in keys)
+                {
+                    if (ObjectDictionary.ContainsKey(key))
+                        ObjectDictionary.TryRemove(key, out _);
+                }
+
+                GroupDictionary[group].Clear();
+            }
+        }
+
+        public List<TValue> GetValues(TGroup group)
+        {
+            if (!this.GroupDictionary.ContainsKey(group))
+            {
+                return new List<TValue>();
+            }
+
+            return GroupDictionary[group].Values.ToList();
+        }
+
+        public List<TGroup> Groups()
+        {
+            return GroupDictionary.Keys.ToList();
+        }
+
+        public List<TValue> AllValues()
+        {
+            return ObjectDictionary.Values.ToList();
+        }
+
+        public List<TKey> AllKeys()
+        {
+            return ObjectDictionary.Keys.ToList();
+        }
+
+        public List<TKey> GroupKeys(TGroup group)
+        {
+            return ContainsGroup(group) ? GroupDictionary[group].Keys.ToList() : new List<TKey>();
+        }
+
+        public List<TValue> GroupValues(TGroup group)
+        {
+            return ContainsGroup(group) ? GroupDictionary[group].Values.ToList() : new List<TValue>();
+        }
+
+        public TValue GetValue(TKey key)
+        {
+            return ObjectDictionary.ContainsKey(key) ? ObjectDictionary[key] : default;
+        }
+
+        public int Count() => ObjectDictionary.Count;
+
+        public int Count(TGroup group)
+        {
+            return ContainsGroup(group) ? GroupDictionary[group].Count : 0;
+        }
+    }
+}