This example creates a form with a menubar. Items of the menu are added and deleted dynamically in runtime by "Add" and "Remove" buttons. If menu item is selected alert box with its name is shown. import javafx.ui.*; import java.lang.System; //alert data model declaration class AlertModel { attribute AlertText:String; attribute ShowAlert:boolean; } var am = AlertModel { AlertText: "Text" ShowAlert: false }; //menu data model class MenuSource { attribute items:MenuItem*; attribute malert:AlertModel; bottom: add_button } visible: true }