no luck 
USTRUCT(BlueprintType)
struct FDPath
{
GENERATED_BODY()
/**
* The path to the directory.
*/
UPROPERTY(EditAnywhere, BlueprintReadWrite, meta=(ContentDir))
FDirectoryPath DirectoryContentPath;
};
LogCompile: Error: An explicit Category specifier is required for any property exposed to the editor or Blueprints in an Engine module.