How do I remove the margin around a collapsed header in ExtJS

Is it possible to style a collapsed header in ExtJS so that it doesn't have a margin开发者_高级运维 around it?

It seems it's all being positioned using javascript which means all my attempts to tweak it so far have been futile.

Any help will hopefully prevent me from ramming a full bag of heroin into my veins in order to forget that ExtJS exists for a few precious hours.

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Use cmargins like you would margins.