How to use shortcodes in admin backend

Hi all,

I am currently trying to figure out a solution to this:

I have made a link to a custom page in the admin backend. What i want is that whenever that page content is parsed the shortcode will be parsed also.

For example, the page has [form id=1] and when i load it as a regular user it shows the actual form, but when i call that page in admin backend it shows the shortcode not the form.

Here is the code i use to create a page menu item on the dashboard

function mt_add_pages() {
    // Add a new top-level menu:
   // The first parameter is the Page name(Site Help), second is the Menu name(Help)
   //and the number(5) is the user level that gets access
    add_menu_page('Tenant Report It', 'Tenant Report It', 5, __FILE__, 'mt_toplevel_page');
}
// mt_toplevel_page() displays the page content for the custom Test Toplevel menu
function mt_toplevel_page() {
    $page_id = 119;
	$page_data = get_page( $page_id );
	$content = apply_filters('the_content', $page_data->post_content);
	//echo $content;
	echo do_shortcode($content);
}
// Insert the mt_add_pages() sink into the plugin hook list for 'admin_menu'
add_action('admin_menu', 'mt_add_pages');