Questions: combo with list and dynamic display?

1

Hi,

i have 2 questions:

  1. i need to have a combo, with quite a long list of options. how do i create it with a scroll bar when its getting too long? or do i have to use the List for that?

  2. i need to have an MC that inlcudes 1 combo, that according to what was choosen in that combo other combos should be displayed (its not the same combos, not in amount and not in content). how do i do that?

thanks