title: How can I edit the color of a DisclosurePanel header
body: <p>I'm using GWT to present Disclosure Panels on my web page. I've succesfully created and presented the panel, but the colour of the header is blue. It's the typical link's colour. I've found the function getHeaderTextAccessor() but this can only edit the text and not the style of the header.How can I change the colour?</p>