well when i get the dialog to open nothing is on ur dialog ur list box is blank nothing apears at all and ur button is sized to small and cuts off the word join.
maybe add an alias to trigger the script line in the nicklist and also you should check if the dialog is open when you whois cuz if not you are going to get errors on ur raws

who about adding this to open it up by cliking on a nick in the user list

alias wh { dialog $iif($dialog(whois),-v,-md) whois whois }
menu nicklist {
  Whois:{ whois $$1 | wh } 
}

and maybe doing ur raws on one event line and useing

if ($dialog(whois)) {

to check to see if the dialog is open or not so you dont return errors on ur raws.