diff --git a/Bin/SunnyUI.dll b/Bin/SunnyUI.dll
index 7237ce1a..9c652a34 100644
Binary files a/Bin/SunnyUI.dll and b/Bin/SunnyUI.dll differ
diff --git a/Bin/SunnyUI.pdb b/Bin/SunnyUI.pdb
index d90ae631..2fd0c499 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 7237ce1a..9c652a34 100644
Binary files a/SunnyUI.Demo/Bin/SunnyUI.dll and b/SunnyUI.Demo/Bin/SunnyUI.dll differ
diff --git a/SunnyUI/Controls/UIDataGridView.cs b/SunnyUI/Controls/UIDataGridView.cs
index 6f873ccd..1906c1b7 100644
--- a/SunnyUI/Controls/UIDataGridView.cs
+++ b/SunnyUI/Controls/UIDataGridView.cs
@@ -447,5 +447,11 @@ namespace Sunny.UI
             column.Width = width;
             return column;
         }
+
+        public static DataGridViewColumn SetSortMode(this DataGridViewColumn column, DataGridViewColumnSortMode sortMode = DataGridViewColumnSortMode.Automatic)
+        {
+            column.SortMode = sortMode;
+            return column;
+        }
     }
 }
\ No newline at end of file
diff --git a/SunnyUI/Forms/UIForm.cs b/SunnyUI/Forms/UIForm.cs
index 1ef42074..e26298ab 100644
--- a/SunnyUI/Forms/UIForm.cs
+++ b/SunnyUI/Forms/UIForm.cs
@@ -388,14 +388,25 @@ namespace Sunny.UI
 
         private void ShowMaximize()
         {
+            int screenIndex = 0;
+            for (int i = 0; i < Screen.AllScreens.Length; i++)
+            {
+                if (MousePos.InRect(Screen.AllScreens[i].Bounds))
+                {
+                    screenIndex = i;
+                    break;
+                }
+            }
+
+            Screen screen = Screen.AllScreens[screenIndex];
             if (windowState == FormWindowState.Normal)
             {
                 size = Size;
 
-                Width = ShowFullScreen ? Screen.PrimaryScreen.Bounds.Width : Screen.PrimaryScreen.WorkingArea.Width;
-                Height = ShowFullScreen ? Screen.PrimaryScreen.Bounds.Height : Screen.PrimaryScreen.WorkingArea.Height;
-                Left = 0;
-                Top = 0;
+                Width = ShowFullScreen ? screen.Bounds.Width : screen.WorkingArea.Width;
+                Height = ShowFullScreen ? screen.Bounds.Height : screen.WorkingArea.Height;
+                Left = screen.Bounds.Left;
+                Top = screen.Bounds.Top;
                 StartPosition = FormStartPosition.Manual;
                 SetFormRoundRectRegion(this, 0);
 
@@ -409,8 +420,8 @@ namespace Sunny.UI
                 }
 
                 Size = size;
-                Left = Screen.PrimaryScreen.WorkingArea.Width / 2 - Size.Width / 2;
-                Top = Screen.PrimaryScreen.WorkingArea.Height / 2 - Size.Height / 2;
+                Left = screen.Bounds.Left + screen.WorkingArea.Width / 2 - Size.Width / 2;
+                Top = screen.Bounds.Top + screen.WorkingArea.Height / 2 - Size.Height / 2;
                 StartPosition = FormStartPosition.CenterScreen;
                 SetFormRoundRectRegion(this, ShowRadius ? 5 : 0);
                 windowState = FormWindowState.Normal;
@@ -419,8 +430,12 @@ namespace Sunny.UI
             Invalidate();
         }
 
+        private Point MousePos;
+
         protected override void OnMouseMove(MouseEventArgs e)
         {
+            MousePos = PointToScreen(e.Location);
+
             if (FormBorderStyle == FormBorderStyle.None)
             {
                 bool inControlBox = e.Location.InRect(ControlBoxRect);
diff --git a/Updates.txt b/Updates.txt
index c49eed0d..2790f675 100644
--- a/Updates.txt
+++ b/Updates.txt
@@ -4,6 +4,7 @@
 * 更新UIListBox消息处理Bug
 * 更新页面框架Main命名，继承关系为Private。继承后编译时删除Design.cs里面Main部分
 + UINavMenu增加字体图标显示
+* UIForm最大化支持多屏
 
 2020.05.26
 * 更新页面框架Main叠放次序