SMO . Why I can't create script for clr procedures and functions by using SMO ?

I have many clr functions and procedures.

I need, periodically, create script of these functions, like this:

create function SchemaName.FunctionName(@Parameter int)
as
external name AssemblyName.[Namespace and ClassName].ClrMethodName

I doing like this:

DataTable tab = db.EnumObjects(
  DatabaseObjectTypes.ExtendedStoredProcedure |
  DatabaseObjectTypes.StoredProcedure |
  DatabaseObjectTypes.UserDefinedAggregate |
  DatabaseObjectTypes.UserDefinedDataType |
  DatabaseObjectTypes.UserDefinedFunction |
  DatabaseObjectTypes.SqlAssembly,
  Microsoft.SqlServer.Management.Smo.SortOrder.Urn
);

... and no one clr rocedure or function is enumerated!

Why?

How I should use SMO to generate scripts to create clr-based procedures or functions&

Thank you!

Why Scripter