The first 4 parameters are X, Y, W, H.. the 4th parameter is the item height, and the 5th parameter is the number of items a combo box will display before a scrollbar is added.
You meant the 5th parameter controls the spacing of the items and the 6th controls the number before a scrollbar pops up, right? :) Thanks, works a treat, do you want help with docs on this? I'd be more then happy to work with you on it :).