问Wx.Radiobox.SetBackgroundColour(“粉红色”)在鼠标经过之前不会改变RadioButton的颜色

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class Dlg(wx.Dialog):
    """A simple dialogue box."""

    def __init__(self):
        global app
        app = wx.PySimpleApp()
        wx.Dialog.__init__(self, None,-1)

        self.sizer = wx.FlexGridSizer(cols=1)

    def show(self, cancelBTN=False):
        """Show a dialog with 2 RadioBox"""

        # add two RadioBox

        RadioBox1 = wx.RadioBox(self, -1, label="Wierd color", choices=["", "choice A", "choice B"], validator=RadioObjectValidator())
        RadioBox2 = wx.RadioBox(self, -1, label="Wierd color", choices=["", "choice A", "choice B"], validator=RadioObjectValidator())
        RadioBox1.ShowItem(0, show=False)  # Hide the first choice
        RadioBox2.ShowItem(0, show=False)  # Hide the first choice

        RadioBox1.GetValue = RadioBox1.GetStringSelection
        RadioBox2.GetValue = RadioBox2.GetStringSelection
        self.sizer.Add(RadioBox1, 1, wx.ALIGN_LEFT)
        self.sizer.Add(RadioBox2, 1, wx.ALIGN_LEFT)

        # add buttons for OK

        self.sizer.Add(wx.Button(self, wx.ID_OK), 1, flag=wx.ALIGN_RIGHT)

        self.SetSizerAndFit(self.sizer)

        if self.ShowModal() == wx.ID_OK:
            pass
            # do something

        self.Destroy()

class RadioObjectValidator(wx.PyValidator):
    """ This validator is used to ensure that the user has entered something
        into the text object editor dialog's text field.
    """
    def __init__(self):
        """ Standard constructor.
        """
        wx.PyValidator.__init__(self)

    def Clone(self):
        """ Standard cloner.

            Note that every validator must implement the Clone() method.
        """
        return RadioObjectValidator()

    def Validate(self, win):
        """ Validate the contents of the given RadioBox control.
        """
        RadioBox = self.GetWindow()
        choice = RadioBox.GetValue()

        if not choice:
            wx.MessageBox(u'Choose something please', u'info', wx.OK | wx.ICON_EXCLAMATION)
            RadioBox.SetBackgroundColour("pink")
            RadioBox.SetFocus()
            RadioBox.Refresh()
            return False
        else:
            RadioBox.SetBackgroundColour(
                wx.SystemSettings_GetColour(wx.SYS_COLOUR_WINDOW))
            RadioBox.Refresh()
            return True

    def TransferToWindow(self):
        """ Transfer data from validator to window.

            The default implementation returns False, indicating that an error
            occurred.  We simply return True, as we don't do any data transfer.
        """
        return True  # Prevent wxDialog from complaining.

    def TransferFromWindow(self):
        """ Transfer data from window to validator.

            The default implementation returns False, indicating that an error
            occurred.  We simply return True, as we don't do any data transfer.
        """
        return True  # Prevent wxDialog from complaining.

if __name__ == "__main__":
    test = Dlg()
    test.show()