javafx combobox contextmenu not displayed - combobox

Question

my problem is:
i made a combobox and i want to use context menu on it's elements, so when i'm setting the cellfactory as shown below, i can't see the items in any more and the context menu does not show.
CBXGroups.setCellFactory(new Callback<ListView<String>, ListCell<String>>() {
public ListCell<String> call(ListView<String> param) {
final ListCell<String> cell = new ListCell<String>();
final ContextMenu cellMenu = new ContextMenu();
MenuItem rimuoviDalControllo = new MenuItem("RIMUOVI DAL CONTROLLO");
MenuItem rimuoviDefinitivamente = new MenuItem("RIMUOVI DEFINITIVAMENTE");
rimuoviDalControllo.setOnAction(new EventHandler<ActionEvent>() {
public void handle(ActionEvent event) {
Service.deleteGroupFromControl(cell.getText(),CBXControllo.getSelectionModel().getSelectedItem());
populateLists();
}
});
rimuoviDefinitivamente.setOnAction(new EventHandler<ActionEvent>() {
public void handle(ActionEvent event) {
Service.deleteGroup(cell.getText());
populateLists();
}
});
cellMenu.setOnShowing(new EventHandler<WindowEvent>() {
public void handle(WindowEvent event) {
cell.requestFocus();
}
});
cellMenu.getItems().addAll(rimuoviDalControllo,rimuoviDefinitivamente);
cell.contextMenuProperty().bind(Bindings.when(Bindings.isNotNull(cell.itemProperty())).then(cellMenu).otherwise((ContextMenu) null));
return cell;
}
});

Answer 1

You can't see the items because you haven't set the text in your ListCell. You can do this with a one-liner:
cell.textProperty().bind(cell.itemProperty());
The context menu is trickier, and I don't really have a solution for it. The issue is that the ComboBox uses a PopupControl to display the list view, and the popup control has autoHide set to true. So when you click on the list view, the popup closes (preventing you seeing the context menu). There's no way to access the popup control, so I don't think there's going to be any way to do this.
Registering a context menu with items in a combo box seems like an unusual thing to do; I wonder if there is a better approach for what you want to do. A MenuButton is similar to a ComboBox in some ways (control that displays a popup with options), but it has a menu hierarchy so you can include cascading menus. This might provide the kind of functionality you want.