How to use

addEventFilter

method

in

javafx.scene.control.ComboBoxBase

@Override
protected void filterKeys(T control) {
 super.filterKeys(control);
 if (control instanceof FxComponent) {
  control.addEventFilter(KeyEvent.ANY, event -> {
   if (!control.isEditable() && ((FxComponent) control).getTableCell() != null) {
    // don't allow to navigate within the cells of a table if combobox is used as an editor
    // @todo: verify if still necessary in newer versions than java 9
    switch (event.getCode()) {
     case PAGE_DOWN:
     case PAGE_UP:
     case HOME:
     case END:
     case LEFT:
     case RIGHT:
      event.consume();
    }
   }
  });
 }
}