u can use $nopath into your init

on *:dialog:log_search:*:*:{
  if $devent == init {
    var %x 0
    while $findfile($logdir,*.log,%x) {
      inc %x
      did -a $dname 10 $nopath($findfile($logdir,*.log,%x))
    }
    did -c $dname 8
  }

u can remove if ($did == 6) dialog -x $dname and add "OK" in the parameter of button

button "Close", 6, 290 180 45 12, ok

$did($dname,N).text can be $did(N)