DCA - Extend only eval

Hi.
Is it possible to only extend eval of field?

For example I have made module which extend event with some extra fields.
I have need to extend or change field "location" eval so that 'tl_class' will have 'w50' and not 'long' (as core).

Does anybody has some experience or idea how to achieve that?

Kind regards,
Andraz

untested

PHP Code:

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$GLOBALS['TL_DCA']['tl_events']['fields']['location']['eval']['tl_class'] = 'w50'; 


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Unfortunately it doesn't work :)

Don't know why my post wasn't submited but ok.

Andreas unfortunately this code snippet isn't working :S