Item Checking not possible with UltimateListCtrl in ULC_VIRTUAL mode

[Ven]

Following is the system and software info

Platforms: Windows XP and OSX Lion
Activestate Python 2.7.2
wxPython2.9-osx-cocoa-py2.7 (for OSX)
wxPython2.9-win32-py27 (for Windows XP)

I am trying to create a UltimateListCtrl using ULC_VIRTUAL and
ULC_REPORT mode. I would like to know how can I put a checkbox beside
the first column of every row and catch the event when a user checks
the box. I was able to do the same using UltimateListCtrl without
VIRTUAL mode. But, with the ULC_VIRTUAL flag ON, I don't know how to
proceed. Following is the code I created, but this still doesn't allow
me to check the boxes associated with the first column. Please help.

import wx
import images
import random
import os, sys
from wx.lib.agw import ultimatelistctrl as ULC

class TestUltimateListCtrl(ULC.UltimateListCtrl):
def __init__(self, parent, log):

ULC.UltimateListCtrl.__init__(self, parent, -1,
agwStyle=ULC.ULC_AUTO_CHECK_CHILD|ULC.ULC_VIRTUAL|ULC.ULC_REPORT|
ULC.ULC_SINGLE_SEL|ULC.ULC_VRULES|ULC.ULC_HRULES)
self.SetItemCount(1000)
self.table_fields=['First','Second','Third']
field_index=0
for field in self.table_fields:
info = ULC.UltimateListItem()
info._mask = wx.LIST_MASK_TEXT | wx.LIST_MASK_IMAGE |
wx.LIST_MASK_FORMAT | ULC.ULC_MASK_CHECK
info._image = []
info._format = wx.LIST_FORMAT_CENTER
info._kind = 1
info._text = field
info._font= wx.Font(13, wx.ROMAN, wx.NORMAL, wx.BOLD)
self.InsertColumnInfo(field_index, info)
self.SetColumnWidth(field_index,175)
field_index += 1

def getColumnText(self, index, col):
item = self.GetItem(index, col)
return item.GetText()

def OnGetItemText(self, item, col):
return "Item %d, Column %d" % (item,col)

def OnGetItemColumnImage(self, item, col):
return []

def OnGetItemImage(self, item):
return []

def OnGetItemAttr(self, item):
return None

def OnGetItemTextColour(self, item, col):
return None

#def OnGetItemColumnCheck(self, item, col):
#return True

#def OnGetItemCheck(self, item):
#item=self.GetItem(item)
#return item.IsChecked()

def OnGetItemToolTip(self, item, col):
return None

def OnGetItemKind(self, item):
return 1

def OnGetItemColumnKind(self, item, col):
if col==0:
return self.OnGetItemKind(item)
return 0

class TestFrame(wx.Frame):
def __init__(self, parent, log):
wx.Frame.__init__(self, parent, -1, "UltimateListCtrl in
wx.LC_VIRTUAL mode", size=(700, 600))
panel = wx.Panel(self, -1)
sizer = wx.BoxSizer(wx.VERTICAL)
listCtrl = TestUltimateListCtrl(panel, log)
sizer.Add(listCtrl, 1, wx.EXPAND)
panel.SetSizer(sizer)
sizer.Layout()
self.CenterOnScreen()
self.Show()

if __name__ == '__main__':
import sys
app = wx.PySimpleApp()
frame = TestFrame(None, sys.stdout)
frame.Show(True)
app.MainLoop()

Btw, following is the code I used to create the same thing without the
VIRTUAL mode. And in this case, I can check the boxes beside the first
column data in every row. But, I will be working with tens of
thousands of items and I cannot rely on loading the items like below
because it is very slow. Hence, I want to use the Virtual List, but I
don't know how to get the same functionality in it.

import wx
import images
import random
import os, sys
from wx.lib.agw import ultimatelistctrl as ULC

class TestUltimateListCtrl(ULC.UltimateListCtrl):
def __init__(self, parent, log):

ULC.UltimateListCtrl.__init__(self, parent, -1,
agwStyle=ULC.ULC_REPORT|ULC.ULC_SINGLE_SEL|ULC.ULC_VRULES|
ULC.ULC_HRULES)

self.table_fields=['First','Second','Third']
field_index=0
for field in self.table_fields:
info = ULC.UltimateListItem()
info._mask = wx.LIST_MASK_TEXT | wx.LIST_MASK_IMAGE |
wx.LIST_MASK_FORMAT | ULC.ULC_MASK_CHECK
info._image = []
info._format = wx.LIST_FORMAT_CENTER
info._kind = 1
info._text = field
info._font= wx.Font(13, wx.ROMAN, wx.NORMAL, wx.BOLD)
self.InsertColumnInfo(field_index, info)
self.SetColumnWidth(field_index,175)
field_index += 1

for record_index in range(0,1000):
for field in self.table_fields:
if self.table_fields.index(field)==0:
self.InsertStringItem(record_index, 'Item %d, Column %d' %
(record_index,self.table_fields.index(field)),it_kind=1)
else:
self.SetStringItem(record_index, self.table_fields.index(field),
'Item %d, Column %d' % (record_index,self.table_fields.index(field)))

class TestFrame(wx.Frame):
def __init__(self, parent, log):
wx.Frame.__init__(self, parent, -1, "UltimateListCtrl in
wx.LC_VIRTUAL mode", size=(700, 600))
panel = wx.Panel(self, -1)
sizer = wx.BoxSizer(wx.VERTICAL)
listCtrl = TestUltimateListCtrl(panel, log)
sizer.Add(listCtrl, 1, wx.EXPAND)
panel.SetSizer(sizer)
sizer.Layout()
self.CenterOnScreen()
self.Show()

if __name__ == '__main__':
import sys
app = wx.PySimpleApp()
frame = TestFrame(None, sys.stdout)
frame.Show(True)
app.MainLoop()