Index: lib/redmine/themes.rb
===================================================================
--- lib/redmine/themes.rb	(Revision 1045)
+++ lib/redmine/themes.rb	(Arbeitskopie)
@@ -69,4 +69,8 @@
     super((@current_theme && @current_theme.stylesheets.include?(source)) ?
       "/themes/#{@current_theme.dir}/stylesheets/#{source}" : source)
   end
+
+  def path_to_stylesheet(source)
+    stylesheet_path source
+  end
 end