GWT: context menu in RichTextArea

I'm using a RichTextArea in a GWT app. I want to add a context menu to my RichTextArea:

public class MyRichTextArea extends RichTextArea implements HasContextMenuHandlers {
    public HandlerRegistration addContextMenuHandler(ContextMenuHandler h) {
        return addDomHandler(h, ContextMenuEvent.getType());
    }
}

(...)

myRichTextArea.addContextMenuHandler(new ContextMenuHandler() {
    public void onContextMenu(ContextMenuEvent event) {
        contextMenu.show();
    }
});

This works, however, the context menu only appears when I right-click on the border of the Ric开发者_如何转开发hTextArea. If I right-click into the RichTextArea, e.g. on the contained text, the browser's default context menu is shown.

How can I display my own context menu?

Prevent default context memu:

myRichTextArea.addDomHandler(new ContextMenuHandler() {

@Override public void onContextMenu(ContextMenuEvent event) {
    event.preventDefault();
    event.stopPropagation();
            // do what you want to do instead
}

}, ContextMenuEvent.getType());

I would go after a method that tells you that the rich text area has the focus, like hasfocus, or maybe better, an event listener (addFocusListener) to tell you when the focus is there on a mouse click for the right mouse button?

Does that make sense?