Trying using 'bytes' as the data type for the pad source/sinks.  This
seemed to work for me.

-John

On Tue, Nov 20, 2012 at 8:08 AM, Roy Thompson <rthom...@gmail.com> wrote:

> Is it possible to create hierarchical blocks that have GrExtras
> messages as the inputs or outputs?  The standard pad source and sink
> blocks don't appear to provide a way to do this.
>
> Thanks,
> Roy
>
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