mayavi 4.7.2 does not work with wxPython toolkit backend.

Please can help me. I am having trouble running mayavi with wxpython

ran mayavi2 with pyqt5 and comes up with properly

removed pyqt5 and installed wxpython

ran mayavi2 with wxpython and I just see the splash screen but no ide.

when I run https://docs.enthought.com/mayavi/mayavi/auto/example_wx_embedding.html I get this crash:

```
Traceback (most recent call last):
File "C:/Users/Owner/AppData/Roaming/JetBrains/PyCharmCE2020.2/scratches/scratch_37.py", line 47, in
frame = MainWindow(None, wx.ID_ANY)
File "C:/Users/Owner/AppData/Roaming/JetBrains/PyCharmCE2020.2/scratches/scratch_37.py", line 43, in __init__
kind='subpanel').control
File "C:\sixdof\mayavi\venv\lib\site-packages\traits\has_traits.py", line 1678, in edit_traits
args,
File "C:\sixdof\mayavi\venv\lib\site-packages\traitsui\view.py", line 462, in ui
ui.ui(parent, kind)
File "C:\sixdof\mayavi\venv\lib\site-packages\traitsui\ui.py", line 244, in ui
self.rebuild(self, parent)
File "C:\sixdof\mayavi\venv\lib\site-packages\traitsui\wx\toolkit.py", line 108, in ui_subpanel
ui_panel.ui_subpanel(ui, parent)
File "C:\sixdof\mayavi\venv\lib\site-packages\traitsui\wx\ui_panel.py", line 85, in ui_subpanel
ui_panel_for(ui, parent, False)
File "C:\sixdof\mayavi\venv\lib\site-packages\traitsui\wx\ui_panel.py", line 95, in ui_panel_for
ui.control = control = Panel(ui, parent, buttons).control
File "C:\sixdof\mayavi\venv\lib\site-packages\traitsui\wx\ui_panel.py", line 174, in __init__
sw = panel(ui, cpanel)
File "C:\sixdof\mayavi\venv\lib\site-packages\traitsui\wx\ui_panel.py", line 274, in panel
panel, content[0], ui
File "C:\sixdof\mayavi\venv\lib\site-packages\traitsui\wx\ui_panel.py", line 433, in fill_panel_for_group
panel, group, ui, suppress_label, is_dock_window, create_panel
File "C:\sixdof\mayavi\venv\lib\site-packages\traitsui\wx\ui_panel.py", line 589, in __init__
self.add_items(content, panel, self.sizer)
File "C:\sixdof\mayavi\venv\lib\site-packages\traitsui\wx\ui_panel.py", line 909, in add_items
editor.prepare(item_panel)
File "C:\sixdof\mayavi\venv\lib\site-packages\traitsui\editor.py", line 236, in prepare
self.init(parent)
File "C:\sixdof\mayavi\venv\lib\site-packages\tvtk\pyface\ui\wx\scene_editor.py", line 59, in init
self._create_scene()
File "C:\sixdof\mayavi\venv\lib\site-packages\tvtk\pyface\ui\wx\scene_editor.py", line 100, in _create_scene
self._scene = factory.scene_class(self.control)
File "C:\sixdof\mayavi\venv\lib\site-packages\tvtk\pyface\ui\wx\decorated_scene.py", line 70, in __init__
self._setup_axes_marker()
File "C:\sixdof\mayavi\venv\lib\site-packages\tvtk\pyface\ui\wx\decorated_scene.py", line 127, in _setup_axes_marker
self._background_changed(self.background)
File "C:\sixdof\mayavi\venv\lib\site-packages\tvtk\pyface\ui\wx\decorated_scene.py", line 204, in _background_changed
m.set_outline_color(0,0,0)
AttributeError: 'OrientationMarkerWidget' object has no attribute 'set_outline_color'
```
I have tried running with wxpython 4.0.5 and get the same result.

Here is my environment

```
(venv) C:\sixdof\mayavi>python
Python 3.7.7 (tags/v3.7.7:d7c567b08f, Mar 10 2020, 10:41:24) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.

(venv) C:\sixdof\mayavi>pip list
Package Version
-------------- -------
apptools 4.5.0
configobj 5.0.6
envisage 4.9.2
mayavi 4.7.2
numpy 1.19.3
Pillow 8.0.1
pip 20.2.4
pip-autoremove 0.9.1
pyface 7.1.0
Pygments 2.7.2
setuptools 50.3.2
six 1.15.0
traits 6.1.1
traitsui 7.1.0
vtk 9.0.1
wxPython 4.1.0
```