You have to do two things:
Use org.eclipse.ui.exportWizards
extension point (which you already did)
In your Applications action bar advisor
class first create the standard workbench action for export and then add it in any of your menu.
Code Snippet
// Creating and registering the action
IWorkbenchAction export = ActionFactory.EXPORT.create(window);
register(export);
// adding it to standard file menu
fileMenu.add(export);
>>Full Code - ApplicationActionBarAdvisor
package wiztest;
import org.eclipse.jface.action.GroupMarker;
import org.eclipse.jface.action.ICoolBarManager;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.action.MenuManager;
import org.eclipse.ui.IWorkbenchActionConstants;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.actions.ActionFactory;
import org.eclipse.ui.actions.ActionFactory.IWorkbenchAction;
import org.eclipse.ui.application.ActionBarAdvisor;
import org.eclipse.ui.application.IActionBarConfigurer;
public class ApplicationActionBarAdvisor extends ActionBarAdvisor {
private IWorkbenchAction exitAction;
private IWorkbenchAction export;
public ApplicationActionBarAdvisor(IActionBarConfigurer configurer) {
super(configurer);
}
protected void makeActions(final IWorkbenchWindow window) {
exitAction = ActionFactory.QUIT.create(window);
register(exitAction);
export = ActionFactory.EXPORT.create(window);
register(export);
}
protected void fillMenuBar(IMenuManager menuBar) {
MenuManager fileMenu = new MenuManager("&File", IWorkbenchActionConstants.M_FILE);
menuBar.add(fileMenu);
menuBar.add(new GroupMarker(IWorkbenchActionConstants.MB_ADDITIONS));
fileMenu.add(export);
fileMenu.add(exitAction);
}
protected void fillCoolBar(ICoolBarManager coolBar) {
}
}
>>Menu Entry

>>Export Wizard
