How can I change the sort order of child products and set a default value?

[karaoke]

Hi,

Please take a look at

Code Select Expand

http://www.funny-faces.co.uk/dev/couple-caricatures/two-person-colour-caricature-a3-print-detail .

As you see there's a custom field (i.e. Extra 6x4 Prints) and 5 child products. At the moment, drop down options are showing in random order and once you refresh the page, the ordering will change.
Also, I don't need to have a default value for this drop down menu. I want to have something like "Please Select" as the default option.

Can you please let me know if there's any possibility to fix these 2 issues?

Thank you