Adding a command to a Pmw.counter widget

[Mark Light]

Hi,
   I have a Pmw.Counter widget and I would like to add a command that
is called on pressing either the up or down arrows (the command will be
the same for both). I have managed to do this for the entryfield with
"entryfield_command = ", but can't get the same to work for the arrows,
could someone help me out with how to do this.

Many thanks,

Mark.