LibSFDropDown

It's a dropdown menu library.
Includes standard options from UIDropDownMenu and some new ones like:

info.remove = [function(self)] -- The function that is called when you click the remove button
info.order = [function(self, delta)] -- The function that is called when you click the up or down arrow button
info.OnEnter = [function(self, arg1, arg2)] -- Handler OnEnter
info.OnLeave = [function(self, arg1, arg2)] -- Handler OnLeave

Usage:

local lsfdd = LibStub("LibSFDropDown-1.5")

API Documentation