I have a structure specified by a macro:

def function {
def description { } ;
def calculation { } ;
};

and a macro for displaying the description of a function in a box ( type -b ):

def info {
%1 ; <--- possibly a problem
description ;
};

( 'description' is just a 'type' command which prints out some info on the
specific function ).

I use this to display an arbitrary function. Example:

def d_por {
def description { text ( Calculates porosity from density ) ; } ;
def calculation { ... } ;
};

which lets me do:

info d_por ;

to display the description of d_por. THIS WORKS FINE.

Now, I want 'info' to be a button in my window which asks the user for the
name of the function s/he want described:

getstring ( Enter function name ) ;
info ( %B ) ; <--- PROBLEM ???

The last line here should, according to the manual, be identical to
( if I entered "d_por" ):

info d_por ;

but the interpreter definately does not think so!

Appearently it is illegal to write:

%B ;

or

( %B );

even if it is legal to write:

%1

inside a macro.

What is wrong here? Is what I'm trying to do IMPOSSIBLE? Why?