“VIEWS” on same window

I need some suggestions on how to implement this. This is a newbie question

I want different views based on user state:

-When user is disconnected I want to show a LOGIN FORM

-After login I want to show a form with BUTTON like PAUSE and LOGOFF

-If user press PAUSE button, show a form showing LOGOFF and PAUSE OFF button

I don’t want develop three main forms, just one (if possible) showing on and off a container.

Thanks for any suggestion

Valter