rails_admin problem in raoutes, parallel login area in devise

hello friends,
i am using rails_admin as webapp admin interface. it create a User model by default using Devise gem. after that i am creating another authorization area member. now /admin route change to /member/sign_in from user/sign_in.

any body have idea how to create a parallel login area in devise with rails_admin.

/admin => /user/sign_in (default)

after

rails g devise member.

it converted to

/admin => /member/sign_in

thanx in advance.