wxGrid issue

Hi,
Just hit a bug with wxGrid.
It is on OSX 10.8.

Steps to reproduce:

1. Create grid.
2. On the Widget tab select "Label Background color"
3. Try to select a predefined color - I tried APPFACE.

Here is the backtrace:

[code]
ERROR   : None
An unexpected error occurred!

Exception type:      <type 'exceptions.ValueError'>
Exception details:

Application stack traceback:
  File "/Users/igorkorot/dbhandler/wxGlade/new_properties.py", line
1834, in display_dialog
    self._check_for_user_modification(value, activate=True)
  File "/Users/igorkorot/dbhandler/wxGlade/new_properties.py", line
1401, in _check_for_user_modification
    return Property._check_for_user_modification(self, new_value,
force, activate)
  File "/Users/igorkorot/dbhandler/wxGlade/new_properties.py", line
168, in _check_for_user_modification
    self.on_value_edited(new_value)
  File "/Users/igorkorot/dbhandler/wxGlade/new_properties.py", line
152, in on_value_edited
    self._notify()
  File "/Users/igorkorot/dbhandler/wxGlade/new_properties.py", line
176, in _notify
    self.owner.properties_changed([self.name])
  File "/Users/igorkorot/dbhandler/wxGlade/widgets/grid/grid.py", line
309, in properties_changed
    self._update_widget_properties(modified)
  File "/Users/igorkorot/dbhandler/wxGlade/widgets/grid/grid.py", line
277, in _update_widget_properties
    if m("label_bg_color"):     self.widget.SetLabelBackgroundColour(
misc.string_to_color(self.label_bg_color) )
  File "/Users/igorkorot/dbhandler/wxGlade/misc.py", line 209, in
string_to_color
    raise ValueError

Date and time:       2019-03-14T20:47:02.101485
Python version:      2.7.11
wxPython version:    3.0.2.0
wxWidgets platform:  __WXMAC__
wxGlade version:     0.9.2
[/code]

Sorry I didn't tried the other one on the branch yet...

Thank you.