Try something like...

Code:
alias nicks {
  var %x = $nick($chan,0)
  while (%x) {
    did -a [color:red]<dialog>[/color] [color:red]<ID>[/color] $nick($chan,%x)
    dec %x
  }
}

on 1:dialog:mdx_dialog:sclick:6: {
  did -r [color:red]<dialog>[/color] [color:red]<ID>[/color] 
  nicks
}


Change <dialog> to your dialog name.
Change <ID> to the ID number.