from_param returns a sub-object expand button

[stuart-cls]

ALL software version info

panel 0.13.1 / param 1.12.0 / bokeh 2.4.3 / Python 3.8 / Windows 10

Description of expected behavior and the observed behavior

Using the from_param method on a widget that supports objects results in an undesired expand sub-object button.

If the same syntax is used on a list of objects that are not Parameterized, the button is not shown.

Expected: the sub-object button is not shown (expand_button=False).

Alternate could be allowing the expand_button kw_arg to be set from the from_param method.

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

import panel
import param

class A(param.Parameterized):
    number = param.Number()

class B:
    pass

a = A()
b = B()

class C(param.Parameterized):
    selection = param.Selector(objects=[a])

class D(param.Parameterized):
    selection = param.Selector(objects=[b])

c = C()
d = D()

panel.extension()
app = panel.Column(
    panel.widgets.RadioButtonGroup.from_param(c.param.selection),
    panel.widgets.RadioButtonGroup.from_param(d.param.selection))
app.show()

Screenshots or screencasts of the bug in action