$addRefdesListbox = $addRefdesFrame2->BrowseEntry(-variable=>\$searchString,
-fg=> 'black',
-bg=> 'white',
-exportselection => 0,
-browsecmd => sub{$addRefdesEntry->insert('end',$refdesMaxValue{$searchString}+1)},
-listcmd=> \&doSearch,
)->pack(-side=>'left');