how to remove the focus on disclosure panel's header

i noticed that whenever i click the disclosure panel's header, it got开发者_如何转开发 focused, namely you can see the black dotted border around the header, is there any way i can get rid of that? Thanks.

You can achieve this by setting css style outline:0 on the Disclosure header:

.gwt-DisclosurePanel .header {
  outline:0;
}

See also http://css-tricks.com/removing-the-dotted-outline/ Basically you need to remove the outline from the a anchor element.