Not really drop-down, but RW Gui has programmable menus...
hmm might take a look at that but I am using the API Gui for most of my things and the RW GUI box might be a bit out of place in it 
EDIT: RW Gui source code is public (on github): if you feel brave, you may add drop-down lists to it... (hint, hint, ... )
Though tempting i have 0 experience creating such a thing and not a lot of time atm so maybe in the future 
bump 
@red51 How hard would it be to create a GuiDropdown menu in the API?
The way I imagine it, it should be like a small label but with an arrow on the right side, when the player clicks the arrow a scrollable dropdown appears with one value in each row. The values can be predefined by for instance .setRows(int rows) and the text set by .setRowText(int rowNumber, String text)
I may be biased by RW-Gui architecture, but I would expect each item of the drop-down list -- as well as of other types of menus -- to have:
so the item set-up method would be int addItem(String text, int id, Object data), returning the item position on the list/menu.
I would expect a callback function to be called on item selection, passing the id and the data.
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if you feel brave, you may add drop-down lists to it... (hint, hint, ... 
