[Dextrose] [PATCH] Prevent multiple XS icon when re register

[Bernie Innocenti]

El Fri, 06-08-2010 a las 14:59 -0400, Martin Abente escribió:
> Re register patch did not consider the XS button option logic.
> This  patch makes sure previous icon will be removed before adding
> the new one.
> 
> Signed-off-by: Martin Abente <mabente at paraguayeduca.org>

Applied as is (but we should do something about button.__class__, I
think).

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