I am using drupal 7 and i am creating the subtheme from omega theme.

In my case i want a page without left and right sidebars. But when i inspect the page.tpl.php from alpha theme it contains only this much of code for printing attributes, content and footer region

Here is my page.tpl.php

print $attributes;
  if (isset($page['header']))

   print render($page['header']);

  endif; 

 if (isset($page['content']))

    print render($page['content']);

 endif;

  if (isset($page['footer']))

     print render($page['footer'])

  endif;

In the above snipped i don't find any option to show/hide sidebars as we used to do like in garland theme