New GitHub issue #100608 from Erriez:<br>

<hr>

<pre>
# Bug report

A submenu on a Treeview is not clickable. The screencapture demonstrates the problem:

`Copy | Selected` -> Not clickable
`Copy | All` -> Not clickable
`Paste` -> Works


Test code:

```python
from tkinter import *
from tkinter import ttk


class App(Tk):
    def __init__(self, *args, **kwargs):
        Tk.__init__(self, *args, **kwargs)

        # Create menu
        self.tree_menu = Menu(self, tearoff=0)

        # Create Copy submenu Selected and All (Not working)
        self.table_submenu_copy = Menu(self, tearoff=0)
        self.tree_menu.add_cascade(label="Copy", menu=self.table_submenu_copy)
        self.table_submenu_copy.add_command(label="Selected", command=self.copy_selected)
        self.table_submenu_copy.add_command(label="All", command=self.copy_all)

        # Create normal menu (Works)
        self.tree_menu.add_command(label="Paste", command=self.paste)

        # Create Treeview
        tree_scroll = ttk.Scrollbar(self)
        tree_scroll.pack(side=RIGHT, fill=Y)

        columns = ['first_name', 'last_name', 'age']
        self.tree = ttk.Treeview(self, columns=columns, show="headings")
        self.tree.pack(side=LEFT, fill=BOTH)

        self.tree.heading("first_name", text="First Name")
        self.tree.heading("last_name", text="Last Name")
        self.tree.heading("age", text="Age")

        # Insert values
        self.tree.insert('', END, values=("Piet", "Hendriks", 23))
        self.tree.insert('', END, values=("Jan", "van Veen", 46))
        self.tree.insert('', END, values=("Karin", "Dijkstra", 55))
        self.tree.insert('', END, values=("Sonja", "Bakker", 16))
        self.tree.insert('', END, values=("Kees", "Visser", 89))

        # Right mouseclick
        self.tree.bind("<Button-3>", self.do_popup)

    def do_popup(self, event):
        # display the popup menu
        try:
            self.tree_menu.selection = self.tree.set(self.tree.identify_row(event.y))
            self.tree_menu.post(event.x_root, event.y_root)
        finally:
            # make sure to release the grab (Tk 8.0a1 only)
            self.tree_menu.grab_release()

    def copy_selected(self):
        print('Copy selected:', self.tree.selection())

    def copy_all(self):
        print('Copy all:', self.tree.selection())

    def paste(self):
        print('Paste')


def main():
    root = App()
    root.mainloop()


if __name__ == '__main__':
    main()
```

# Your environment

- CPython versions tested on: 3.10.6
- Operating system and architecture: Ubuntu 22.04

Any suggestion how to fix this?
</pre>

<hr>

<a href="https://github.com/python/cpython/issues/100608">View on GitHub</a>
<p>Labels: type-bug</p>
<p>Assignee: </p>