[Tutor] Dialogs

[kreglet]

I am having a problem with GtkDialogs.

Ref:  http://faq.pygtk.org/index.py?req=show&file=faq10.011.htp 
http://faq.pygtk.org/index.py?req=show&file=faq10.011.htp  

I want to add a treeview to the dialog. 
The first time btnDialog is pressed the dialog shows with the treeview in
it. 
If I press btnDialog a second time the app closes and I get a "Segmentation
fault" error.
Without adding the treeview, the dialog works as expected.
 
Do you have to destroy the widgets added to a dialog when you destroy the
dialog? 
If so how?

#!/usr/bin/env python

import pygtk
import gtk

btnDialog = gtk.Button("Dialog")
# list of items to display
plist = gtk.ListStore(int, str)
plist.append( (0, "Item 1",) )
plist.append( (1, "Item 2",) )
plist.append( (2, "Item 3",) )


# the Treeview
treeview = gtk.TreeView()
model = treeview.get_selection()
model.set_mode(gtk.SELECTION_SINGLE)
r = gtk.CellRendererText()
treeview.insert_column_with_attributes(-1, "Items", r, text=1)
treeview.set_model(plist)

class NewWindow(gtk.Window):

    def btnDialogClick(self, widget):
        dialog = gtk.Dialog('Choose Item',
            self,  # the window that spawned this dialog
            gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT,                       
            ("Play Now", 77, gtk.STOCK_CLOSE, gtk.RESPONSE_CLOSE))
        dialog.vbox.pack_start(gtk.Label('Do you want to play a game?'))
        
        dialog.vbox.pack_start(treeview)
        
        dialog.show_all()
        result = dialog.run()
        if result == 77:
            print "Play Button Clicked"
        elif result == gtk.RESPONSE_CLOSE:
            print "Close Button Clicked"
        dialog.destroy()
    #----------------------------------------------------------------
    def __init__(self):
        super(NewWindow, self).__init__()
        self.set_title("test")
        self.set_size_request(1024, 768)
        self.set_keep_above(True)
        self.set_position(gtk.WIN_POS_CENTER)
        self.set_modal(True)
        fixed = gtk.Layout()
        fixed.put(btnDialog, 400, 5)
        btnDialog.connect("clicked", self.btnDialogClick)
        self.add(fixed)
        self.connect("destroy", gtk.main_quit)
        self.show_all()
NewWindow()
gtk.main()
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