title: WP7 Textbox with title inside of textbox
body: <p>I would like to have a textbox that lets a user enter some text (obviously). Let's say it's 'Title'. Is there a pre-built control that shows the name of the field (Title in this case) inside of the text box and then have it clear out when the user enter the field. Example: The search box at the top of this page has 'Search' but when you enter the box it goes away.</p>