Accessing base class method

Could any corba guru help me ?

=Question:=

How I can access method form my old library class
from servant class ?
i.e do something like this:

class One_impl:ublic Foreign{};

void Two:doSomethingElse( One_ptr p )
{
Foreign *f = dynamic_cast<Foreign *>(p);
p->doSomething();
}


=Details:=

I have next construction:

OLD LIBRARY:

class Foreign
{
void doSomething();
}

IDL:

interface One {}

interface Two
{
doSomethingElse( in One s );
}

SERVANT:

class One_impl : public POA_one, Foreign {}

void Two:doSomethingElse( One_ptr p )
{
Foreign *f = dynamic_cast<Foreign *>(p);
p->doSomething();
}

How I can access method Foreign::doSomething() from Two::doSomethingElse() ?

Now I use dirty workaround:

interface One
{
One implementation();
}

One One::implementation()
{
return this; // return pointer instead of expected _retn,
// to be able to cast it later
}

Is there a right way ?

Thank you!
DM\S