diff --git a/SunnyUI/Common/USystem.cs b/SunnyUI/Common/USystem.cs
index a185e53a..a55be8b3 100644
--- a/SunnyUI/Common/USystem.cs
+++ b/SunnyUI/Common/USystem.cs
@@ -27,6 +27,7 @@ using System.Drawing;
 using System.IO;
 using System.Linq;
 using System.Reflection;
+using System.Threading;
 using System.Windows.Forms;
 
 namespace Sunny.UI
@@ -131,9 +132,19 @@ namespace Sunny.UI
         /// Delays the specified ms.
         /// </summary>
         /// <param name="ms">The ms.</param>
-        public static void Delay(int ms)
+        public static void Sleep(int ms)
         {
-            System.Threading.Thread.Sleep(Math.Max(0, ms));
+            var sw = Stopwatch.StartNew();
+            var sleepMs = ms - 16;
+            if (sleepMs > 0)
+            {
+                Thread.Sleep(sleepMs);
+            }
+
+            while (sw.ElapsedMilliseconds < ms)
+            {
+                Thread.Sleep(0);
+            }
         }
 
         /// <summary>
diff --git a/SunnyUI/Controls/UITabControl.cs b/SunnyUI/Controls/UITabControl.cs
index 418756ad..cb7e1397 100644
--- a/SunnyUI/Controls/UITabControl.cs
+++ b/SunnyUI/Controls/UITabControl.cs
@@ -27,6 +27,7 @@
  * 2022-01-13: V3.1.0 修改删除页面时的页面跳转
  * 2022-04-18: V3.1.5 关闭按钮增加鼠标移入的效果
  * 2022-04-20: V3.1.5 不显示标签页时屏蔽左右键
+ * 2022-05-11: V3.1.8 修复屏蔽左右键后其他控件无法使用左右键的问题
 ******************************************************************************/
 
 using Sunny.UI.Win32;
@@ -198,26 +199,20 @@ namespace Sunny.UI
                 }
             }
 
-            return base.ProcessCmdKey(ref msg, keyData);
-        }
+            if (Focused && !TabVisible)
+            {
+                switch (keyData)
+                {
+                    case Keys.Left:
+                        //if (TabVisible)
+                        return true;
+                    case Keys.Right:
+                        //if (TabVisible)
+                        return true;
+                }
+            }
 
-        protected override void OnKeyDown(KeyEventArgs e)
-        {
-            if (!TabVisible)
-            {
-                if (e.KeyCode == Keys.Left || e.KeyCode == Keys.Right)
-                {
-                    e.Handled = true;
-                }
-                else
-                {
-                    base.OnKeyDown(e);
-                }
-            }
-            else
-            {
-                base.OnKeyDown(e);
-            }
+            return base.ProcessCmdKey(ref msg, keyData);
         }
 
         [DefaultValue(true)]