How to change css value's through CssResource mechanism?

I have a FlexButton widget and want to change the width, that is
defined in the css file, in a flexible way.
FlexButton uses ClientBundle and CssResource.

I looked at the @eval and value() functions but don't think they help
me.
@eval references to a static function such that it results in a value
for all FlexButton instances, while I want to have different width for
different instances.

I hoped to pass in a Preferences instances that contains the width
that is then used in the css file, but I don't see how I get this to
work.

Please some advice on how best to do this?
-Ed

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