i know this can be alot neater with $iif's etc etc etc but so Kirbeh_Pr0nz could get a look at it, ive kept it simple.

menu * {
  Host Getter: dialog -dm vhost vhost
}
dialog vhost {
  title "Host Getter :)"
  size -1 -1 175 132
  option dbu
  list 1, 1 12 60 45, sort size vsbar
  text "Channels List:", 2, 3 5 48 7
  list 3, 114 12 60 45, sort size vsbar
  text "Nicks in selected channel:", 4, 108 5 64 7
  edit "", 5, 34 95 102 29, read multi
  text "Host of selected nick:", 6, 35 88 59 8
  button "Get Host", 7, 115 58 50 12
  button "Get Nicks ", 8, 2 58 50 12
  button "Done", 9, 140 116 31 12, flat multi ok cancel
}
on *:dialog:vhost:*:*: {
  var %a = $devent, %b = $did
  if (%a == INIT) { fill.chans }
  if (%a == SCLICK) {
    if (%b == 8) { $iif(($did(1).seltext),fill.nicks $did(1).seltext,echo -a ***** Please select a channel.) }
    if (%b == 7) { $iif(($did(3).seltext),did -ra vhost 5 $address($did(3).seltext,2),echo -a ***** Please select a nick.) }
    if (%b == 9) { dialog -x vhost vhost }
  }
}
alias fill.chans {
  did -r vhost 1
  var %a = $chan(0)
  while (%a) { did -a vhost 1 $chan(%a) | dec %a }
}
alias fill.nicks {
  did -r vhost 3
  var %a = 1, %b = $nick($$1,0)
  while (%a <= %b) { did -a vhost 3 $nick($$1,%a) | inc %a }
}