code: def on_btn_metadata(self, event):
          
          # make sure we have a measurements file
          if not self.check_for_meas_file():
              return
          # make sure all files of the same type have been combined
          if not self.check_for_uncombined_files():
              return
          if self.data_model_num == 2:
              wait = wx.BusyInfo('Compiling required data, please wait...')
              wx.SafeYield()
              self.ErMagic_frame = ErMagicBuilder.MagIC_model_builder(self.WD, self, self.er_magic)
          elif self.data_model_num == 3:
              wait = wx.BusyInfo('Compiling required data, please wait...')
              wx.SafeYield()
              self.ErMagic_frame = ErMagicBuilder.MagIC_model_builder3(self.WD, self, self.contribution)
          #
          self.ErMagic_frame.Show()
          self.ErMagic_frame.Center()
          # gets total available screen space - 10%
          size = wx.DisplaySize()
          size = (size[0] - 0.3 * size[0], size[1] - 0.3 * size[1])
          self.ErMagic_frame.Raise()
          del wait
docs: Initiate the series of windows to add metadata
          to the contribution.