Official Tutorials page use outdated code (import "flet.border", "flet.buttons")

[heximing]

Description

Official Tutorials page
https://flet.dev/docs/controls/elevatedbutton
use outdated code (import "flet.border", "flet.buttons")

Code example to reproduce the issue:

import flet as ft
from flet.border import BorderSide
from flet.buttons import RoundedRectangleBorder

def main(page: ft.Page):

    page.add(
        ft.ElevatedButton(
            "Styled button 1",
            style=ft.ButtonStyle(
                color={
                    ft.MaterialState.HOVERED: ft.colors.WHITE,
                    ft.MaterialState.FOCUSED: ft.colors.BLUE,
                    ft.MaterialState.DEFAULT: ft.colors.BLACK,
                },
                bgcolor={ft.MaterialState.FOCUSED: ft.colors.PINK_200, "": ft.colors.YELLOW},
                padding={ft.MaterialState.HOVERED: 20},
                overlay_color=ft.colors.TRANSPARENT,
                elevation={"pressed": 0, "": 1},
                animation_duration=500,
                side={
                    ft.MaterialState.DEFAULT: BorderSide(1, ft.colors.BLUE),
                    ft.MaterialState.HOVERED: BorderSide(2, ft.colors.BLUE),
                },
                shape={
                    ft.MaterialState.HOVERED: RoundedRectangleBorder(radius=20),
                    ft.MaterialState.DEFAULT: RoundedRectangleBorder(radius=2),
                },
            ),
        )
    )

ft.app(target=main)

Describe the results you received:
ModuleNotFoundError: No module named 'flet.border'

Describe the results you expected:
Should be:

from flet import BorderSide
from flet import RoundedRectangleBorder

Additional information you deem important (e.g. issue happens only occasionally):
I searched for old issues. It seems like in early versions we moved BorderSide and RoundedRectangleBorder one folder up. I am new to Flet. There might be other places in the official tutorials have problems like this.
Furthermore, I use this code, but could not make the button bgcolor pink by clicking other place. Clicking "TAB" on the keyboard can make the button bgcolor pink, but it keeps pink; cannot changed back to yellow anymore. Is there something else wrong with my setup?

Flet version (pip show flet):
0.74

Operating system:
Windows 10

Additional environment details:
PyCharm 2023.1.2 (Community Edition)
Build #PC-231.9011.38, built on May 16, 2023

[ndonkoHenri]

Fixed in flet-dev/website#139