TextEditor support for dark theme

src/Shared/HandyControlDemo_Shared/Data/MessageToken.cs

@@ -52,5 +52,7 @@
 
         public static readonly string LangUpdated = nameof(LangUpdated);
 
+        public static readonly string SkinUpdated = nameof(SkinUpdated);
+
     }
 }

src/Shared/HandyControlDemo_Shared/Data/MessageToken.tt

@@ -28,7 +28,8 @@ var messageList = new List<string>
 	"NavigationWindow",
 	"TouchDragMoveWindow",
 	"DialogContainer",
-	"LangUpdated"
+	"LangUpdated",
+	"SkinUpdated"
 };
 #>
 namespace HandyControlDemo.Data
@@ -40,4 +41,4 @@ namespace HandyControlDemo.Data
 
     <#}#>
 }
-}
+}