Adding a QMenu to Maya
https://groups.google.com/forum/#!forum/python_inside_maya

code:

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import shiboken
from PySide import QtGui, QtCore
import maya.OpenMayaUI as apiUI

def getMayaWindow():
    ptr = apiUI.MQtUtil.mainWindow()
    if ptr is not None:
        return shiboken.wrapInstance(long(ptr), QtGui.QMainWindow)
def addMenuItem(mayaWindow=None, title=''):
    mainMenu = QtGui.QMenu(title)
    menu = mayaWindow.menuBar().addMenu(mainMenu)
    return mainMenu
def addMenuAction(menu=None, title='', action=''):
    return menu.addAction(action)

def addSeparator(menu):
    return menu.addSeparator()

mayaWindow = getMayaWindow()
mainMenu = addMenuItem(mayaWindow, 'TESTING')
for a in range(20):
    addMenuAction(mainMenu, title='', action='TESTING%s'%str(a))
    if not a % 5:
        addSeparator(mainMenu)