Search function for blog only

CMS & WordPress
1

I have a search form for categories only on the blog page. To keep pages from showing in the results I am using a function in the functions.php file.

function SearchFilter($query) {
if ($query->is_search) {
$query->set('post_type', 'post');
}
return $query;
}
add_filter('pre_get_posts','SearchFilter');

But this function also filters out the pages from the search results when doing a Page Search in the admin on the All Pages page. It will only show category post in the results.
How can I modify the function to allow pages to show only when using the search in the admin?

WordPress v3.2.1

2

Found an answer.
By adding is_admin to the function, it only excludes pages if the search is not in the admin.

function SearchFilter($query) {
if (!$query->is_admin && $query->is_search) {
$query->set('post_type', 'post');
}
return $query;
}
add_filter('pre_get_posts','SearchFilter');