How do I use Page with new template file?

I made a new Template file (named full-size.php) in my child-theme directory with code like below; (I am using twenty-ten-child theme.)

<?php
/*
Template Name: template-full-size
*/
?>

<?php get_header(); ?>

		<div id="container">
			<div id="content" role="main">

			<?php
			/* Run the loop to output the page.
			 * If you want to overload this in a child theme then include a file
			 * called loop-page.php and that will be used instead.
			 */
			get_template_part( 'loop', 'page' );
			?>

			</div><!-- #content -->
		</div><!-- #container -->

<?php get_footer(); ?>

And I made a Page with “template-full-size” template in dropdown menu and wrote a certain text.
But the text does not shown.(header and footer is shown well.)

How can I resolve this problem?
Please Help me.