problem generating c++ headers for SetExpression.idl

[Botis]

hi
so far i used the headers exported from offapi.rdb and it worked. unfortunately, i need SetExpression and GetExpression from com::sun::star::text::textfield , and those don't seem to be in there. so i tried generating the headers like this:
1) idlc -O . -I"C:\path\to\sdk\idl" "C:\path\to\sdk\idl"\com\sun\star\text\textfield\GetExpression.idl
result: i get a file GetExpression.urd
2) do the same for SetExpression.idl to get SetExpression.urd
3) regmerge mystuff.rdb /UCR SetExpression.urd GetExpression.urd
result: i get a file mystuff.rdb
4) cppumaker -BUCR -OsomeOutputPath mystuff.rdb types.rdb offapi.rdb
result: someOutputPath gets filled with lots of headers from types.rdb and offapi.rdb, but there's no SetExpression.hpp or GetExpression.hpp (or .*) anywhere in there

what am i missing or doing wrong here?