Thanks to the comments you posted for me i changed this code a bit
alias comchan {
window -m @ComChans
//echo @comchans 12*4Listing ComChans With $1
var %nchan = 1
:loop
while (%nchan <= $comchan($1,0)) {
//echo @ComChans 12*14 $+ $comchan($1,%nchan)
inc %nchan
goto loop
}