Multiple Twitter Account login at a Time IOS


I am new in IOS development . I am make complete App for twitter by Using FHSTwitterEngine . I want to login Multiple Account of user in my App . First Time when I Login it gives me Twitter Login web View to Authorise my App to use my account ( email & password Authorise App) and it got login . And now when i want to Login Users Multiple another accounts too by using difference User Account ( email & password ) But when I call again FHSTwitterEngine methods to login Again user Another Twitter Account for Multiple Account purpose it show me last login account for Authorise App . What should i do that Twitter Login web View Always ask me to login Again .

I want to use Multiple Accounts in my App As Twitter App !