Connecting Login Themes With Yii Login System

Hi all,

I create some app using yii, then i want to use seperated Login theme as guest landing page and others themes as users landing page (when users logged in)

here my themes folder structure:

myapp/

-----/protected

-----/themes/

----------guest/

----------users/

in my Controller.php i set init rule below:

if GUEST then

  use guest_theme

else

  use users_theme

then i replace code into main.php in guest/layout folder from myapp/protected/views/site/login.php.

Error below are appeared:

Undefinied variable: model

My question are how to connect guest themes with yii login system so it would handle all login process.

Thansk a lot