How to use the pygubu.widgets.accordionframe.AccordionFrame function in pygubu

def create_accordion_widget_list(self, treelist):
        acf = AccordionFrame(self.widgetlist)
        acf.grid(sticky=tk.NSEW)
        acf.bind('<>', self.on_widgetlist_group_toogle)

        #Default widget image:
        default_image = ''
        try:
            default_image = StockImage.get('22x22-tk.default')
        except StockImageException as e:
            pass

        #Start building widget tree selector
        roots = {}
        sections = {}
        for key, wc in treelist:
            root, section = key.split('>')
            #insert root

try:
            default_image = StockImage.get('22x22-tk.default')
        except StockImageException as e:
            pass

        #Start building widget tree selector
        roots = {}
        sections = {}
        for key, wc in treelist:
            root, section = key.split('>')
            #insert root
            if root not in roots:
                roots[root] = acf.add_group(root, root)
            #insert section
            if key not in sections:
                sectionacf = AccordionFrame(roots[root])
                sectionacf.grid(sticky=tk.NSEW, padx='5 0')
                sectionacf.bind('<>',
                                self.on_widgetlist_group_toogle)
                sectiongrp = sectionacf.add_group(key, section)
                sections[key] = AutoArrangeFrame(sectiongrp)
                sections[key].grid(sticky=tk.NSEW)

            #insert widget
            w_image = default_image
            try:
                w_image = StockImage.get('22x22-{0}'.format(wc.classname))
            except StockImageException as e:
                pass

            #define callback for button
            def create_cb(cname):

app = AccordionFrame(root)
    app.grid(sticky=tk.NSEW)

    top = app.winfo_toplevel()
    top.rowconfigure(0, weight=1)
    top.columnconfigure(0, weight=1)

    g = app.add_group('g1', 'Tk widgets')
    l = tk.Label(g, text="Label1")
    l.grid()
    l = tk.Label(g, text="Label2")
    l.grid()
    g = app.add_group('g2', 'Ttk widgets')
    ##
    app = AccordionFrame(g)
    app.grid(sticky='nsew', padx="5 0")
    g = app.add_group('g1', 'Containers')
    l = tk.Label(g, text="Label1")
    l.grid()
    l = tk.Label(g, text="Label2")
    l.grid()
    g = app.add_group('g2', 'Control')
    l = tk.Label(g, text="Label3")
    l.grid()
    l = tk.Label(g, text="Label4")
    l.grid()

    tk.mainloop()

    @classmethod
    def set_gimages(cls, img_open, img_close):
        if cls.IMAGES is None:
            cls.IMAGES = [
                tk.PhotoImage(file=img_open),
                tk.PhotoImage(file=img_close),]
        else:
            cls.IMAGES[0].configure(file=img_open)
            cls.IMAGES[1].configure(file=img_close)


if __name__ == '__main__':
    root = tk.Tk()

    app = AccordionFrame(root)
    app.grid(sticky=tk.NSEW)

    top = app.winfo_toplevel()
    top.rowconfigure(0, weight=1)
    top.columnconfigure(0, weight=1)

    g = app.add_group('g1', 'Tk widgets')
    l = tk.Label(g, text="Label1")
    l.grid()
    l = tk.Label(g, text="Label2")
    l.grid()
    g = app.add_group('g2', 'Ttk widgets')
    ##
    app = AccordionFrame(g)
    app.grid(sticky='nsew', padx="5 0")
    g = app.add_group('g1', 'Containers')

def __init__(self, master=None, **kw):
        ttk.Frame.__init__(self, master, **kw)
        self.__images = None
        self.__groups = {}
        self.columnconfigure(0, weight=1)

        if AccordionFrame.IMAGES is None:
            AccordionFrame.IMAGES = [
                tk.PhotoImage(data=img_down),
                tk.PhotoImage(data=img_right),]
        self.__images = AccordionFrame.IMAGES