How to disable a button control in wxPython?

[eriggs]

I'm somewhat new to Python, and I'm trying to figure out how to
disable a button control.  I have included my test source code for
reference.  Thanks in advance for any help offered.  --  Earl

######################################################################
from wxPython.wx import *

class ButtonFrame(wxFrame):
    'Creates a frame with a single button in the center'
    def __init__(self):
        wxFrame.__init__(self, NULL, -1, 'wxPython',
                         wxDefaultPosition, (330, 210))

        panel = wxPanel(self, -1) 

        #wxTextCtrl(wxWindow* parent, wxWindowID id, 
        #           const wxString& value = "", 
        #           const wxPoint& pos,
        #           const wxSize& size = wxDefaultSize, 
        #           long style = 0, const wxValidator& validator, 
        #           const wxString& name = "text")
        tc = wxTextCtrl(panel, -1, "", wxPoint(10, 10), \
                    wxSize(300, 100), wxTE_MULTILINE|wxTE_READONLY)
        self.msgtext = tc

        button1 = wxButton(panel, 111, 'Start', wxPoint(10, 130), \
                           wxSize(100, 30))
        EVT_BUTTON(self, 111, self.onButtonStart)

        button1.SetDefault()
        self.StartButton = button1
 

        button2 = wxButton(panel, 112, 'Quit', wxPoint(210, 130), \
                           wxSize(100, 30))
        EVT_BUTTON(self, 112, self.onButtonQuit)
        EVT_CLOSE(self, self.OnCloseWindow)

        self.QuitButton = button2

        # Disable Quit button
        #self.QuitButton.Disable()
        # Enable Start button
        #self.StartButton.Enable()


    def onButtonStart(self, event):
        'Create a message dialog when the button is clicked'
        dlg = wxMessageDialog(self, 'Starting...',\
                              'Start', wxOK)
        dlg.ShowModal()
        dlg.Destroy()

        self.setText("Starting program...")
        # Enable Quit button
        #self.QuitButton.Enable()
        # Disable Start button
        #self.StartButton.Disable()
        # Start program loop


    def onButtonQuit(self, event):
        'Create a message dialog when the button is clicked'
        dlg = wxMessageDialog(self, 'Quitting...',\
                              'Stop', wxOK)
        dlg.ShowModal()
        dlg.Destroy()

        self.setText("Stopping program...")

        self.Close(true)


    def OnCloseWindow(self, event):
        self.Destroy()


    def setText(self, msg):
        'Create a message dialog when the button is clicked'
        self.msgtext.Clear()
        self.msgtext.AppendText(msg)


class App(wxApp):
    def OnInit(self):
        'Create the main window and insert the custom frame'
        frame = ButtonFrame()
        frame.Show(true)
        return true # Yes, continue processing

# Create the app and start processing messages
app = App(0)
app.MainLoop()