It's custom marking menu exemple

ui_markinMenu

import pymel.core as pmc
import maya.mel

class CheckForMM():

    #----- Get object Infos
    @classmethod
    def getObjInfos(cls):

        objSel = pmc.selected()
        # blablabla


    #----- Get panel Infos
    @classmethod
    def checkPanel(cls):

        #----- Get graphEditor
        graphEditor = pmc.panel('graphEditor1', ex=True)
        panelFocus = pmc.getPanel(wf=True)
        # blablabla










#----- QDManip markingMenu Animation Select
class QdMarkingMenuSelect():


    #####################################################################
    #----- Create Popup
    #####################################################################
    @classmethod
    def popupMM(cls, parent):

        #----- If UI Exists delete
        if pmc.popupMenu('tempMM', exists=True):
            pmc.deleteUI('tempMM')

        #----- popupMenu
        popupMM = pmc.popupMenu('tempMM', b=1, ctl=False, alt=False, sh=False, aob=True, p=parent, mm=True)

        return popupMM


    #----- Check Process
    @classmethod
    def checkProcess(cls, *arg):
        check = CheckForMM()
        qdAttrType = check.getObjInfos()
        graphEditor, panelFocus = check.checkPanel()

        #----- Launch markingMenu
        if graphEditor is True and str(panelFocus) == 'graphEditor1':
            cls.qdGraphEditorMM()
        else:
            if qdAttrType is not None:
                if 'QDManip' in str(qdAttrType) or 'QDMocap' in str(qdAttrType):
                    cls.qdmAnimationSelectMM()
                elif str(qdAttrType) == 'RigSkin':
                    cls.qdmRigSkinMM()
            else:
                cls.qdNoSelectMM()



    #----- QD Animation Select
    @classmethod
    def qdmAnimationSelectMM(cls, *arg):

        #----- Get Popup:
        popupMM = cls.popupMM('viewPanes')

        #----- Create Item
        pmc.menuItem('LipsUp', l='Lips Up', c=LipsUp, rp='N', p=popupMM)
        pmc.menuItem('LipsDn', l='Lips Dn', c=LipsDn, rp='S', p=popupMM)

        # blablabla