I followed the instructions @ http://doc.silverstripe.org/doku.php?id=widgets on how to install a widget on other pages. So in page.php I changed:
...............................................................................................
class Page extends SiteTree {
   public static $db = array(
   );
   public static $has_one = array(
   );   
}
...............................................................................................

to

...............................................................................................
class Page extends SiteTree {
   public static $db = array(
   );   
    static $has_one = array(
   "Sidebar" => "WidgetArea",
);   
function getCMSFields() {
   $fields = parent::getCMSFields();
   $fields->addFieldToTab("Root.Content.Widgets", new WidgetAreaEditor("Sidebar"));
   return $fields;
}
}
...............................................................................................

This works and I am able to add widgets on pages by using $Sidebar but the blog widgets have now dissapeared? Any ideas anyone?