diff --git a/src/Net_40/HandyControlDemo_Net_40/HandyControlDemo_Net_40.csproj b/src/Net_40/HandyControlDemo_Net_40/HandyControlDemo_Net_40.csproj
index d3ea6447..6b412450 100644
--- a/src/Net_40/HandyControlDemo_Net_40/HandyControlDemo_Net_40.csproj
+++ b/src/Net_40/HandyControlDemo_Net_40/HandyControlDemo_Net_40.csproj
@@ -172,6 +172,9 @@
     <Resource Include="..\..\Shared\HandyControlDemo_Shared\Resources\Img\Flag\ca-Es.png">
       <Link>Resources\Img\Flag\ca-Es.png</Link>
     </Resource>
+    <Resource Include="..\..\Shared\HandyControlDemo_Shared\Resources\Img\Flag\cs.png">
+      <Link>Resources\Img\Flag\cs.png</Link>
+    </Resource>
     <Resource Include="..\..\Shared\HandyControlDemo_Shared\Resources\Img\Flag\en.png">
       <Link>Resources\Img\Flag\en.png</Link>
     </Resource>
diff --git a/src/Net_GE45/HandyControlDemo_Net_GE45/HandyControlDemo_Net_GE45.csproj b/src/Net_GE45/HandyControlDemo_Net_GE45/HandyControlDemo_Net_GE45.csproj
index e6e6fbff..8743d131 100644
--- a/src/Net_GE45/HandyControlDemo_Net_GE45/HandyControlDemo_Net_GE45.csproj
+++ b/src/Net_GE45/HandyControlDemo_Net_GE45/HandyControlDemo_Net_GE45.csproj
@@ -174,6 +174,9 @@
     <Resource Include="..\..\Shared\HandyControlDemo_Shared\Resources\Img\Flag\ca-Es.png">
       <Link>Resources\Img\Flag\ca-Es.png</Link>
     </Resource>
+    <Resource Include="..\..\Shared\HandyControlDemo_Shared\Resources\Img\Flag\cs.png">
+      <Link>Resources\Img\Flag\cs.png</Link>
+    </Resource>
     <Resource Include="..\..\Shared\HandyControlDemo_Shared\Resources\Img\Flag\en.png">
       <Link>Resources\Img\Flag\en.png</Link>
     </Resource>
diff --git a/src/Shared/HandyControlDemo_Shared/Resources/Img/Flag/cs.png b/src/Shared/HandyControlDemo_Shared/Resources/Img/Flag/cs.png
new file mode 100644
index 00000000..45e95782
Binary files /dev/null and b/src/Shared/HandyControlDemo_Shared/Resources/Img/Flag/cs.png differ
diff --git a/src/Shared/HandyControlDemo_Shared/UserControl/Main/NonClientAreaContent.xaml b/src/Shared/HandyControlDemo_Shared/UserControl/Main/NonClientAreaContent.xaml
index 6ef024ff..b09336e4 100644
--- a/src/Shared/HandyControlDemo_Shared/UserControl/Main/NonClientAreaContent.xaml
+++ b/src/Shared/HandyControlDemo_Shared/UserControl/Main/NonClientAreaContent.xaml
@@ -117,6 +117,9 @@
                     <Button Tag="zh-cn" Style="{StaticResource ButtonCustom}">
                         <Image Width="32" Source="/HandyControlDemo;component/Resources/Img/Flag/cn.png"/>
                     </Button>
+                    <Button Tag="cs" Style="{StaticResource ButtonCustom}">
+                        <Image Width="32" Source="/HandyControlDemo;component/Resources/Img/Flag/cs.png"/>
+                    </Button>
                     <Button Tag="en" Style="{StaticResource ButtonCustom}">
                         <Image Width="32" Source="/HandyControlDemo;component/Resources/Img/Flag/en.png"/>
                     </Button>