Why i can't to see in dashboard a new theme child ?

Hi, i was tring (to try) to build a child theme but i can’t to see the new theme “Twenty Ten Child” from the Dashboard › Themes

I’ve maked a new directory in wp-content/themes (remote with upload), and name it twentyten-child
– /wp-content/themes/twentyten/twentyten-child

I’ve saved the code below in a file named style.css for to change the color of the site’s title (as test), and i’ve dropped this file in the new directory.

/*
Theme Name: Twenty Ten Child
Theme URI: http://www.guidaolanda.it/blog/
Description: Child theme for the Twenty Ten theme
Author: Your name here
Template: twentyten
*/
@import url("../twentyten/style.css");

#site-title a {
color: #009900;
}

Why i can’t to see in dashboard a new theme child ?

I ‘ve ulpload also the screenshot.png, i’ve tried with another browser (cache ?), i’ve tried to change in css the Template with twentyten, Twenty Ten, Twenty_Ten

Thanks in advanced for your replay

Istruction from http://codex.wordpress.org/Child_Themes

Using a child theme, all it takes is three simple steps:
1. Make a new directory in wp-content/themes, and name it twentyten-child (or anything you like).
2. Save the code below in a file named style.css, and drop this file in the new directory.
3. Go to Dashboard › Themes and activate you new theme, the Twenty Ten Child.