A customized menu bar without using the widget tk.Menu

Question: Customized menu bar without using the widget tk.Menu?

This example uses a tk.Toplevel as a popup window and displays the added tk.Menubutton.
The Submenu follows ths defined Style of the Top tk.Menubutton.

TODO:

• Close the Popup Window if clicked outside or another Top Menubutton.
• Extend with other than only tk.Menubutton
• Keyboard support

import tkinter as tkclass Menu:    def __init__(self, parent, **kwargs):        self._popup = None        self._menubutton = []        self.parent = parent        self.parent.bind('<Button-1>', self.on_popup)    def on_popup(self, event):        w = event.widget        x, y, height = self.parent.winfo_rootx(), self.parent.winfo_rooty(), self.parent.winfo_height()        self._popup = tk.Toplevel(self.parent.master, bg=self.parent.cget('bg'))        self._popup.overrideredirect(True)        self._popup.geometry('+{}+{}'.format(x, y + height))        for kwargs in self._menubutton:            self._add_command(**kwargs)    def add_command(self, **kwargs):        self._menubutton.append(kwargs)    def _add_command(self, **kwargs):        command = kwargs.pop('command', None)        menu = self.parent        mb = tk.Menubutton(self._popup, text=kwargs['label'],                           bg=menu.cget('bg'),                           fg=menu.cget('fg'),                           activebackground=menu.cget('activebackground'),                           activeforeground=menu.cget('activeforeground'),                           borderwidth=0,                           )        mb._command = command        mb.bind('<Button-1>', self._on_command)        mb.grid()    def _on_command(self, event):        w = event.widget        print('_on_command("{}")'.format(w.cget('text')))        self._popup.destroy()        if w._command is not None:            w._command()

Usage:

class App(tk.Tk):    def __init__(self):        super().__init__()        self.geometry("200x200")        style = {'bg': "#102A43", 'fg': "white",                  'activebackground': "#243B53", 'activeforeground': "white",                 'borderwidth': 0}        menu1 = tk.Menubutton(self, text="Menu1", **style)        submenu1 = Menu(menu1)        submenu1.add_command(label="Option 1.1")        submenu1.add_command(label="Option 1.2")        menu1.grid(row=0, column=0)        menu2 = tk.Menubutton(self, text="Menu2", **style)        submenu2 = Menu(menu2)        submenu2.add_command(label="Option 2.1")        submenu2.add_command(label="Option 2.2")        menu2.grid(row=0, column=2)if __name__ == "__main__":    App().mainloop()

Tested with Python: 3.5 - 'TclVersion': 8.6 'TkVersion': 8.6