from umetrics import *
from ribbonabc import RibbonAddInABC
from tkinter import Tk, messagebox

class AddInCommand(RibbonAddInABC):


    def on_command(Self) :
        root=Tk()
        root.withdraw()
        messagebox.showinfo(title= 'Hello', message= 'Hello World!')
        root.destroy()

    def get_button_name(Self):
        return 'Hello World!'
group_order = [AddInCommand]