You can display any NativeMenu object at an arbitrary time and location above a window, by calling the menu display() method. The method requires a reference to the stage, thus only content in the application sandbox can display a menu as a pop-up.

The following method displays the menu defined by a NativeMenu object named popupMenu in response to a mouse click:

private function onMouseClick(event:MouseEvent):void {
    popupMenu.display(event.target.stage, event.stageX, event.stageY);
}