now hc styles can be referenced in window.resource

by the way, supported multiple themes at the same time, It may be related to #574

src/Shared/HandyControl_Shared/Properties/Langs/LangProvider.cs

@@ -8,7 +8,7 @@ namespace HandyControl.Properties.Langs
 {
     public class LangProvider : INotifyPropertyChanged
     {
-        internal static LangProvider Instance => ResourceHelper.GetResource<LangProvider>("Langs");
+        internal static LangProvider Instance => ResourceHelper.GetResourceInternal<LangProvider>("Langs");
 
         private static string CultureInfoStr;
 

src/Shared/HandyControl_Shared/Properties/Langs/LangProvider.tt

@@ -27,7 +27,7 @@ namespace HandyControl.Properties.Langs
 {
     public class LangProvider : INotifyPropertyChanged
     {
-        internal static LangProvider Instance => ResourceHelper.GetResource<LangProvider>("Langs");
+        internal static LangProvider Instance => ResourceHelper.GetResourceInternal<LangProvider>("Langs");
 
         private static string CultureInfoStr;
 
@@ -81,4 +81,4 @@ namespace HandyControl.Properties.Langs
 
 <#}#>
     }
-}
+}