Drop down questions

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I have a drop down box that will show 50 lines, one for each state.
When I click on the box, it opens up a huge box. Can I limit the size
of the number of options showing and let the person use the scroll bar
for seeing the rest?
Also, I want to show the state two letter code and the name of the
state but I don't need the name to show when they are not selecting,
it just takes up space on the screen. Can I limit the size of the
width of the box to just the two letters and only have the name show
when the box is dropped down?

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