Dropdown Javafx, This class belongs to the package javafx. Node javafx. Here we discuss the Introduction and how does ComboBox work in JavaFX along with examples and code implementation. And I don't know A popup menu of actionable items which is displayed to the user only upon request. I am trying to make the drop down scrollable. By instantiating this ComboBox is a part of the JavaFX library. The default drop down indicator on a MenuButton is a black triangle pointing down. country-state, branch-department-unit. layout. Object javafx.