[BUG] Tabs widget disabled property has no effect

[roiweinreb]

ALL software version info (bokeh, python, notebook, OS, browser, any other relevant packages)

Bokeh version: 2.2.3
Python version: 3.7.5
OS: WSL

Description of expected behavior and the observed behavior

It's expected from the Tabs widget to become disabled by setting its disabled property to True.
The observed behavior is that the widget stays enabled.

Complete, minimal, self-contained example code that reproduces the issue

from bokeh.io.doc import curdoc
from bokeh.models.layouts import Panel, Tabs
from bokeh.models.widgets.markups import Div

tabs = Tabs(
    tabs=[
        Panel(child=Div(text="hello"), title="1"),
        Panel(child=Div(text="there"), title="2"),
    ],
    disabled=True
)

curdoc().add_root(tabs)

[github-actions]

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