def __init__(self, groups=None):
        super(GroupedRequirements, self).__init__(NamedRequirements)
        self.groups = groups or self.default_groups
        self.filename = None
        self.create_default_groups()
def draw(self, context):
        layout = self.layout

        userpref = context.user_preferences

        layout.prop(userpref, "active_section", expand=True)