def _define_structure(self):
    '\n        Define the main sizers building to build this application.\n        '
    self.main_sizer = wx.BoxSizer(wx.VERTICAL)
    self.box_source = wx.StaticBox(self, (- 1), str('Kiessig Thickness Calculator'))
    self.boxsizer_source = wx.StaticBoxSizer(self.box_source, wx.VERTICAL)
    self.dq_name_sizer = wx.BoxSizer(wx.HORIZONTAL)
    self.thickness_size_sizer = wx.BoxSizer(wx.HORIZONTAL)
    self.hint_sizer = wx.BoxSizer(wx.HORIZONTAL)
    self.button_sizer = wx.BoxSizer(wx.HORIZONTAL)
Define the main sizers building to build this application.
def _define_structure(self):
    '\n        \n        '
    self.main_sizer = wx.BoxSizer(wx.VERTICAL)
    self.box_source = wx.StaticBox(self, (- 1), str('Kiessig Thickness Calculator'))
    self.boxsizer_source = wx.StaticBoxSizer(self.box_source, wx.VERTICAL)
    self.dq_name_sizer = wx.BoxSizer(wx.HORIZONTAL)
    self.thickness_size_sizer = wx.BoxSizer(wx.HORIZONTAL)
    self.hint_sizer = wx.BoxSizer(wx.HORIZONTAL)
    self.button_sizer = wx.BoxSizer(wx.HORIZONTAL)