current selected tab issue

[fred4ets]

In the following CME, pressing on the Show tabs button, select one tab (say #2), close dialog and then pressing Show tabs buttons
shows that the current tab is the first, not the one previously selected.

Any idea?

Regards

from traits.api import *
from traitsui.api import *

class Tab(HasTraits):

name = String

class Tabs(HasTraits):

current_tab = Instance(Tab)
tabs_list = List(Instance(Tab))

view = View(Group(UCustom('tabs_list',
                          # springy=True,
                          # width=300,  # width value is arbitrary but required
                          editor=ListEditor(use_notebook=True,
                                            dock_style='tab',
                                            selected='current_tab',
                                            page_name='.name'))),
            kind='subpanel',
            buttons=['Undo', 'OK', 'Cancel', 'Help'])
view.close_result = False

def _current_tab_default(self):
    return (self.tabs_list[0])

def _tabs_list_default(self):

    tabs_list = []
    for i in range(3):
        tab = Tab(name='tab #%d' % (i+1))
        tabs_list.append(tab)
    return (tabs_list)

class Foo(HasTraits):

button = Button('Show tabs')

tabs = Instance(Tabs)

view = View(Group(UItem('button')),
            buttons=['Undo', 'OK', 'Cancel', 'Help'])

def _tabs_default(self):
    return (Tabs())

def _button_fired(self):
    print('current_tab:', self.tabs.current_tab.name)
    self.tabs.edit_traits()

foo = Foo()
if name == 'main':
foo.configure_traits()

Debian x86_64, Python 3.9.2, ETS source from git, PyQt 5.15.2