[Xy-pic] how to change \arrowobject in twocells

[Jürgen Koslowski]

Hello,

I have trouble changing the arrowobject of 2-cells.  Placing the command
\arrowobject{\dir3{->}} inside an \xymatrix does not seem to affect
the 2-cells in there.  Placing this command outside results in an
error message 

<xymatrix 3x2
! Xy-pic error: illegal <dir>: \dir 3{->} not defined.
\xyerror@ ... \errmessage {Xy-pic error: #1}
                                            }

-- Juergen Koslowski

-- 
Juergen Koslowski               If I don't see you no more on this world
ITI, TU Braunschweig               I'll meet you on the next one
koslowj@iti.cs.tu-bs.de               and don't be late!
http://www.iti.cs.tu-bs.de/~koslowj      Jimi Hendrix (Voodoo Child, SR)