diff --git a/SunnyUI/Controls/UITabControl.cs b/SunnyUI/Controls/UITabControl.cs
index 95527694..fe5cfe3d 100644
--- a/SunnyUI/Controls/UITabControl.cs
+++ b/SunnyUI/Controls/UITabControl.cs
@@ -483,7 +483,6 @@ namespace Sunny.UI
                 return;
             }
 
-            removeIndex.ConsoleWriteLine("removeIndex");
             var menuItem = Helper[removeIndex];
             bool showButton = menuItem == null || !menuItem.AlwaysOpen;
             if (showButton)
diff --git a/SunnyUI/Forms/UIFormHelper.cs b/SunnyUI/Forms/UIFormHelper.cs
index df71782b..df5f1161 100644
--- a/SunnyUI/Forms/UIFormHelper.cs
+++ b/SunnyUI/Forms/UIFormHelper.cs
@@ -528,4 +528,70 @@ namespace Sunny.UI
             UINotifier.Show(desc, type, title, isDialog, timeout, inApp);
         }
     }
+
+    public static class FormEx
+    {
+        public static Form ShowFullMask(this Form form)
+        {
+            Point pt = SystemEx.GetCursorPos();
+            Rectangle screen = Screen.GetBounds(pt);
+
+            Form mask = new Form();
+            mask.FormBorderStyle = FormBorderStyle.None;
+            mask.BackColor = Color.FromArgb(0, 0, 0);
+            mask.Opacity = 0.5;
+            mask.ShowInTaskbar = false;
+            mask.StartPosition = FormStartPosition.Manual;
+            mask.Bounds = screen;
+            mask.TopMost = true;
+            mask.Show();
+            return mask;
+        }
+
+        public static Form ShowControlMask(this Control control)
+        {
+            bool topmost = false;
+            Form baseForm = control.RootForm();
+            if (baseForm != null)
+            {
+                topmost = baseForm.TopMost;
+                baseForm.TopMost = true;
+                Application.DoEvents();
+            }
+
+            Form mask = new Form();
+            mask.FormBorderStyle = FormBorderStyle.None;
+            mask.BackColor = Color.FromArgb(0, 0, 0);
+            mask.Opacity = 0.5;
+            mask.ShowInTaskbar = false;
+            mask.StartPosition = FormStartPosition.Manual;
+            mask.Bounds = control.Bounds;
+            mask.Tag = baseForm;
+            mask.Text = topmost.ToString();
+
+            var pt = control.LocationOnScreen();
+            mask.Left = pt.X;
+            mask.Top = pt.Y;
+            mask.Show();
+            mask.TopMost = true;
+            return mask;
+        }
+
+        public static void EndShow(this Form maskForm)
+        {
+            if (maskForm.Tag is Form form)
+            {
+                form.TopMost = maskForm.Text.ToBoolean();
+            }
+        }
+
+        public static void ShowInMask(this Form frm, Form maskForm)
+        {
+            frm.StartPosition = FormStartPosition.Manual;
+            frm.Left = maskForm.Left + (maskForm.Width - frm.Width) / 2;
+            frm.Top = maskForm.Top + (maskForm.Height - frm.Height) / 2;
+            frm.ShowInTaskbar = false;
+            frm.TopMost = true;
+        }
+    }
 }
\ No newline at end of file
diff --git a/SunnyUI/Static/UControl.cs b/SunnyUI/Static/UControl.cs
index dc551fe0..7abe04e9 100644
--- a/SunnyUI/Static/UControl.cs
+++ b/SunnyUI/Static/UControl.cs
@@ -42,6 +42,30 @@ namespace Sunny.UI
             timer.Start();
         }
 
+        public static Point LocationOnScreen(this Control ctrl)
+        {
+            Point point = new Point(0, 0);
+            do
+            {
+                point.Offset(ctrl.Location);
+                ctrl = ctrl.Parent;
+            }
+            while (ctrl != null);
+
+            return point;
+        }
+
+        public static Form RootForm(this Control ctrl)
+        {
+            if (ctrl == null) return null;
+            while (ctrl.Parent != null)
+            {
+                ctrl = ctrl.Parent;
+            }
+
+            return ctrl as Form;
+        }
+
         public static Form GetParentForm(this Control ctrl)
         {
             while (!IsForm(ctrl.Parent))
@@ -77,7 +101,7 @@ namespace Sunny.UI
             return (form.Height - form.ClientSize.Height) - form.BorderSize();
         }
 
-        public static Point LocationOnClient(this Control c)
+        private static Point LocationOnClient(this Control c)
         {
             Point point = new Point(0, 0);
             for (; c.Parent != null; c = c.Parent)
diff --git a/SunnyUI/Static/UEnum.cs b/SunnyUI/Static/UEnum.cs
index f52ff0f0..2858a475 100644
--- a/SunnyUI/Static/UEnum.cs
+++ b/SunnyUI/Static/UEnum.cs
@@ -101,7 +101,7 @@ namespace Sunny.UI
     /// http://about.me/AlekseyNagovitsyn
     /// </remarks>
     [AttributeUsage(AttributeTargets.Field | AttributeTargets.Enum)]
-    internal class DisplayTextAttribute : Attribute
+    public class DisplayTextAttribute : Attribute
     {
         /// <summary>
         /// The default value for the attribute <c>DisplayTextAttribute</c>, which is an empty string
diff --git a/SunnyUI/Units/USuspendCtrlAltDel.cs b/SunnyUI/Units/USuspendCtrlAltDel.cs
index 74a80078..480831c0 100644
--- a/SunnyUI/Units/USuspendCtrlAltDel.cs
+++ b/SunnyUI/Units/USuspendCtrlAltDel.cs
@@ -74,8 +74,8 @@ namespace Sunny.UI
             {
                 Console.WriteLine("SeDebugPrivilege is now available");
             }
+
             CloseHandle(hToken);
-            Console.ReadLine();
         }
 
         public static void Suspend()