drop down list help
im hoping someone can help. i have a really annoying situation where i have a drop down list containing 20 negative numbers, 0 and 20 positive numbers. when clicking on the drop down arrow i would like the list to start on 0 (in the middle) so that when you scroll up it goes through the positive numbers and if you scroll down it goes through the negative numbers.
ive tried searching online but im bot sure im using the right terminology.
many thanks in advance