[Python] pyhton TTKBootstrap Menu - style not applied

I tried TTKBootstrap instead of tkinter and it looks great. However the menu has not been adapted.

I do the following: Create a Windows based on tb.Window

import ttkbootstrap as tb
class App(tb.Window):
def __init__(self):
super().__init__()

# configure the root window
self.title('test ttkbootstrap')
self.geometry('800x600')
style = tb.Style(theme='superhero')


and create a menu in the class constructor

menubar = tb.Menu(self)
self.config(menu=menubar)
# file Menu
filemenu = tb.Menu(menubar, tearoff=False)
filemenu.add_command(
label="Open...",
command=OpenFile
)


It works, but looks like the style is not applied.



Here the full code:

from tkinter import filedialog
import ttkbootstrap as tb

def OpenFile():
filename = filedialog.askopenfilename(initialdir = "/",title = "Select file",filetypes = (("jpeg files","*.jpg"),("all files","*.*")))
print(filename)

def About():
print("This is a simple example of a menu")

class App(tb.Window):
def __init__(self):
super().__init__()

# configure the root window
self.title('test ttkbootstrap')
self.geometry('800x600')
style = tb.Style(theme='superhero')

self.tabList = []

# tabular Widgets
tabControl = tb.Notebook(self, style='lefttab.TNotebook')
tabControl.pack(pady=20)
self.tabList.append(tb.Frame(tabControl))
tabControl.add(self.tabList[-1], text ='First Tab')

self.tabList.append(tb.Frame(tabControl))
tabControl.add(self.tabList[-1], text ='Second Tab')

tabControl.pack(expand=1, fill="both")

# label
self.label = tb.Label(self.tabList[0], text='Hello, First Tab!')
self.label.pack()

# button
self.button = tb.Button(self.tabList[1], text='Click Me')
self.button.pack()

# Initialize and define the menu including functions to be called.

menubar = tb.Menu(self)
self.config(menu=menubar)
# file Menu
filemenu = tb.Menu(menubar, tearoff=False)
filemenu.add_command(
label="Open...",
command=OpenFile
)
filemenu.add_separator()
filemenu.add_command(
label='Exit',
command=self.destroy,
)
menubar.add_cascade(
label="File",
menu=filemenu,
underline=0
)
# help Menu
helpmenu = tb.Menu(menubar, tearoff=False)
helpmenu.add_command(label="About...", command=About)
menubar.add_cascade(label="Help", menu=helpmenu)

if __name__ == "__main__":
app = App()
app.mainloop()

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