code: def _do_layout(self):
          
  
          sizer_csvoptions = wx.FlexGridSizer(5, 4, 5, 5)
  
          # Adding parameter widgets to sizer_csvoptions
          leftpos = wx.LEFT | wx.ADJUST_MINSIZE
          rightpos = wx.RIGHT | wx.EXPAND
  
          current_label_margin = 0  # smaller for left column
          other_label_margin = 15
  
          for label, widget in zip(self.param_labels, self.param_widgets):
              sizer_csvoptions.Add(label, 0, leftpos, current_label_margin)
              sizer_csvoptions.Add(widget, 0, rightpos, current_label_margin)
  
              current_label_margin, other_label_margin = \
                  other_label_margin, current_label_margin
  
          sizer_csvoptions.AddGrowableCol(1)
          sizer_csvoptions.AddGrowableCol(3)
  
          self.sizer_csvoptions = sizer_csvoptions
docs: Sizer hell, returns a sizer that contains all widgets