Documents
self.chk1 = wx.CheckBox(self, label='1')
self.chk1.SetValue(True)
self.chk1.Bind(wx.EVT_CHECKBOX, self.OnCheck)
<object class="wxCheckBox" name="checkbox_id">
<size>200,50</size>
<label>CheckBoxItem</label>
<checked>1</checked>
</object>