I think you need to go back and read the help file.

You said that you have a popup menu for whois, query, etc., yet you're using a dclick event.

Also, you're setting up the dclick like it's a popup menu with the name:command format.

If you're simply trying to whois a person when you double click on the line, it should be something like:
Code:
menu @window {
  dclick: { whois $sline(@window,1) }
}

- Jason