Custom page sidebar using Template dropdown box

In order to accomplish this you will need to also create a separate page template to use. You may need to double check your template head information.

Example:

<?php 
 /*
  * Template Name: Your Template name
 */
?>

This has to be put at the top of the page template. Then within the custom page template you will need to call the custom sidebar that you have.

You will need to put this in the template where you want your sidebar to go:

<?php 
if ! dynamic_sidebar( 'ourPat Sidebar' ) ) :
    ?>
    You need to add widgets for items to show in this area. To add for this area add widgets to "ourPat Sidebar".
    <?php 
endif; 
?>