anchor.diff:  
   snapshot_init() ->
       ref_add(?ANALYSIS_RET, undef),
  -    ref_add(?FILES, []),
  +    init_files(),
       ref_add(?SNAPSHOT_PATH, "").
   
   %%%----------------------------------------------------------------------
  
positive.code: clearMods() ->
      ModuleList = ref_lookup(?MODULE_LIST),
      wxListBox:setSelection(ModuleList, ?wxNOT_FOUND),
      wxControlWithItems:clear(ModuleList).
  
  clearProbs() ->
      ErrorText = ref_lookup(?ERROR_TEXT),
  
negative.code:             case checkDuplicates(?FILES, File) of
                  false ->
                      addListItems(?MODULE_LIST, File),
                      add_file(File),
                      ref_add(?FILE_PATH, getDirectory());
                  Duplicates ->
                      wxTextCtrl:appendText(ref_lookup(?ERROR_TEXT),
  