Hi ExtJS users,

I'm kind of new with ExtJS (working 4 full weeks with it) and I have a problem which I couldn't find in the docs.

I have a panel like this:
HTML Code:
Ext.define('BaseClass.MenuGroup', {
  extend: 'Ext.panel.Panel',
  alias: 'widget.menugroup',
  collapsible: true,
  layout: 'anchor',
  padding: '5'
});
When I collapse the panel, the header changes it CSS "top" property on from 5px to 0px.
Where can I define this css property? I don't want to mess with ext-all.css

Thank you