Adding a command to a Pmw.counter widget

[Martin Franklin]

Mark Light wrote:
> 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.
> 

Looking at the source for the PmwCounter it doesn't look like it exposes 
the buttons callbacks.

I think the best way to do this would be to provide a validator method 
to the Counter's entryfield.  The validator gets called whenever the 
entryfields value changes.

Example validator methods are included in the Pmw documentation.

Martin