diff --git a/CefFlashBrowser/Views/BrowserWindow.xaml b/CefFlashBrowser/Views/BrowserWindow.xaml
index 380bcdc..2488a81 100644
--- a/CefFlashBrowser/Views/BrowserWindow.xaml
+++ b/CefFlashBrowser/Views/BrowserWindow.xaml
@@ -187,8 +187,8 @@
                     Command="{Binding ElementName=browser, Path=StopCommand}"/>
         <KeyBinding Key="F5"
                     Command="{Binding ElementName=browser, Path=ReloadCommand}"/>
-        <!--<KeyBinding Key="F11"
-                    Command="{Binding }"-->
+        <KeyBinding Key="F11"
+                    Command="{Binding ElementName=window, Path=ToggleFullScreenCommand}"/>
         <KeyBinding Key="F12"
                     Command="{Binding ShowDevToolsCommand}"
                     CommandParameter="{Binding ElementName=browser}"/>
diff --git a/CefFlashBrowser/Views/BrowserWindow.xaml.cs b/CefFlashBrowser/Views/BrowserWindow.xaml.cs
index 2d3bdc3..dfa44a5 100644
--- a/CefFlashBrowser/Views/BrowserWindow.xaml.cs
+++ b/CefFlashBrowser/Views/BrowserWindow.xaml.cs
@@ -4,10 +4,12 @@
 using CefFlashBrowser.Utils;
 using CefFlashBrowser.WinformCefSharp4WPF;
 using CefSharp;
+using SimpleMvvm.Command;
 using System;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Controls.Primitives;
+using System.Windows.Input;
 using System.Windows.Interop;
 
 namespace CefFlashBrowser.Views
@@ -119,6 +121,9 @@ public override bool OnContextMenuCommand(IWebBrowser chromiumWebBrowser, IBrows
         private bool _isMaximizedBeforeFullScreen = false;
 
 
+        public ICommand ToggleFullScreenCommand { get; }
+
+
         public bool FullScreen
         {
             get { return (bool)GetValue(FullScreenProperty); }
@@ -132,6 +137,8 @@ public bool FullScreen
 
         public BrowserWindow()
         {
+            ToggleFullScreenCommand = new DelegateCommand(() => { FullScreen = !FullScreen; });
+
             InitializeComponent();
             WindowSizeInfo.Apply(GlobalData.Settings.BrowserWindowSizeInfo, this);
 
@@ -151,13 +158,13 @@ private static void OnFullScreenChange(DependencyObject d, DependencyPropertyCha
                 if (window._isMaximizedBeforeFullScreen)
                     window.WindowState = WindowState.Normal;
 
-                window.Topmost = true;
+                //window.Topmost = true;
                 window.WindowStyle = WindowStyle.None;
                 window.WindowState = WindowState.Maximized;
             }
             else
             {
-                window.Topmost = false;
+                //window.Topmost = false;
                 window.WindowStyle = WindowStyle.SingleBorderWindow;
                 window.WindowState = WindowState.Normal;