diff --git a/Bin/SunnyUI.dll b/Bin/SunnyUI.dll
index 24f4cab1..e8fd6ae1 100644
Binary files a/Bin/SunnyUI.dll and b/Bin/SunnyUI.dll differ
diff --git a/Bin/SunnyUI.pdb b/Bin/SunnyUI.pdb
index 4ae8355c..c18defbc 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 24f4cab1..e8fd6ae1 100644
Binary files a/SunnyUI.Demo/Bin/SunnyUI.dll and b/SunnyUI.Demo/Bin/SunnyUI.dll differ
diff --git a/SunnyUI/Forms/UIForm.cs b/SunnyUI/Forms/UIForm.cs
index fdd7cbb5..f6b66d68 100644
--- a/SunnyUI/Forms/UIForm.cs
+++ b/SunnyUI/Forms/UIForm.cs
@@ -508,7 +508,7 @@ namespace Sunny.UI
         private void ShowMaximize(bool IsOnMoving = false)
         {
             Screen screen = Screen.FromPoint(MousePosition);
-            base.MaximumSize = ShowFullScreen ? Screen.PrimaryScreen.Bounds.Size : Screen.PrimaryScreen.WorkingArea.Size;
+            base.MaximumSize = ShowFullScreen ? screen.Bounds.Size : screen.WorkingArea.Size;
             if (WindowState == FormWindowState.Normal)
             {
                 size = Size;