how to add an xblock as a course tab in edx platform -

i've installed devstack on local machine. planning add chat functionality edx platform students contact instructors of course. (just simple page lists instructors of course link chat them) tried using xblock , created one. appears xblock custom course contents injected units in courseware. want add course tab appear every course lists instructors students can consult via chat. possible via xblock? if not, please suggest other options achieve want?

full tutorial: https://openedx.atlassian.net/wiki/display/ac/adding+a+new+course+tab

add entry point python library's setup.py. note new_tab id of tab, , example.newtab qualified name of new tab class.

entry_points={     "openedx.course_tab": [         "new_tab = example.newtab",     } } 

define new tab class subclass of coursetab , declare properties:

from courseware.tabs import coursetab   class newtab(coursetab):     """a new course tab."""      name = "new_tab"     title = ugettext_noop("new tab")  # don't have user in context, don't want translate @ level.     view_name = "new_tab_view"      @classmethod     def is_enabled(cls, course, user=none):         """returns true if tab enabled."""         return settings.features.get('new_tab_enabled', false) 

relevant: https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/edx-code/se63d12v4xc/78vrqmipbwaj

https://groups.google.com/forum/#!topic/edx-code/ji-_w-nbu7c