Display a specific dynamic sidebar widgets on a specific page

I think what you might need is simply to run register_sidebar() in an 'widgets_init' hook. The TwentyTen theme has examples for register_sidebar() in its functions.php file, but here’s what it might look like:

add_action( 'widgets_init', 'twentyten_widgets_init' );
function twentyten_widgets_init() {
  register_sidebar( array(
    'name' => __( 'News Sidebar', 'yoursite' ),
    'id' => 'sidebar-news',
    'description' => __( 'The News Sidebar Area', 'yoursite' ),
    'before_widget' => '<li id="%1$s" class="widget-container %2$s">',
    'after_widget' => '</li>',
    'before_title' => '<h3 class="widget-title">',
    'after_title' => '</h3>',
  ));

  /*
   * THE REST OF THE SIDEBAR REGISTRATION CODE FROM twentyten_widgets_init() GOES HERE
   */
}

Also, in your template_news.php page template use the following code to call your sidebar which will load the sidebar-news.php file you created above:

<?php get_sidebar( 'news' ); ?>

You shouldn’t need any of the other things you tried, and definitely not any include statements.

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