addEventListener on AppNavItem - event-handling

Question

I am using latest version of Vaadin.
Intended: want to catch an event if AppNavItem (with child elements) is clicked (expanded, toggled).
Code:
#JsModule("#vaadin-component-factory/vcf-nav")
#Tag("vcf-nav-item")
public class AppNavItem extends Component {
public AppNavItem(String label) {
setLabel(label);
}
public AppNavItem setExpanded(boolean value) {
if (value) {
getElement().setAttribute("expanded", "");
} else {
getElement().removeAttribute("expanded");
}
return this;
}
public AppNavItem setIcon(Component icon) {
icon.getElement().setAttribute("slot", "prefix");
int iconElementIndex = getIconElementIndex();
if (iconElementIndex != -1) {
getElement().setChild(iconElementIndex, icon.getElement());
} else {
getElement().appendChild(icon.getElement());
}
return this;
}
}
AppNavItem myItem = new AppNavItem("Project");
myItem.addAttachListener(e -> {
System.out.println(e.toString()); // works on page load as expected !
});
//projectParent.onEnabledStateChanged(false); // does not work
//projectParent.onEnabledStateChanged(true); // does not work
myItem.getElement().addEventListener("onchange", e -> {
System.out.println(e.getType()); // does not work
});
myItem.getElement().addPropertyChangeListener("expanded","onchange", e -> {
System.out.println(e.getPropertyName()); // does not work
});
myItem.getElement().addEventListener("onchange", e -> {
System.out.println(e.getType());
});
myItem.getElement().addPropertyChangeListener("expanded","onchange", e -> {
System.out.println(e.getPropertyName()); // does not work
});
myItem.getElement().addPropertyChangeListener("expanded", e -> {
System.out.println(e.getPropertyName()); // does not work
});
myItem.addItem(...);
I tried several eventTypes like: click, onclick, change, onchange, ontoggle, ...
Unfortunately, almost nothing works, see comment.
What am I doing wrong ?
I expect to catch an event