Drop down menu order ‘wp_page_menu’

Hi

I’m trying to have a drop down menu that shows it’s entries in reverse order of posting. i.e. the reverse of ‘post_date’ parameter in the ‘wp page menu’ Tag.

Would the above be the way to go (setting page order manually), or is it possible to automate this by some PHP that reverses the order ‘post_date’ displays?

Also, that it only effects one drop down menu, not all the drop down menus. For example, when I made the list alphabetic (through the ‘post_title’ parameter) all the drop downs became alphabetic. How do I make it so for just one of them?

Is it possible, or should I be considering a different approach?

Many thanks