Message when open channel

[Dankoo]

In TibiaRL, when you open Advertising channel you receive this message:

Here you can advertise all kinds of things. Among others, you can trade Tibia items, advertise ingame events, seek characters for a quest or a hunting group, find members for your guild or look for somebody to help you with something.
It goes without saying that all advertisements must be conform to the Tibia Rules. Keep in mind that it is illegal to advertise trades including premium time, real money or Tibia
characters.

I was trying to recreate it, so I tried:

creaturescripts.xml

<event type="joinchannel" name="TradeMotd" event="script" value="trademotd.lua"/>

function onJoinChannel(cid, channelId, users)
	if(channelId == CHANNEL_TRADE) then
		if(isPlayer == TRUE) then
				doPlayerSendChannelMessage(cid, "", "Here you can advertise all kinds of things. Among others, you can trade Tibia items, advertise ingame events, seek characters for a quest or a hunting group, find members for your guild or look for somebody to help you with something.It goes without saying that all advertisements must be conform to the Tibia Rules. Keep in mind that it is illegal to advertise trades including premium time, real money or Tibiacharacters.", TALKTYPE_CHANNEL_W, CHANNEL_TRADE)
		end
	end

	return true
end

000-constant.lua

CHANNEL_TRADE = 6

Result: Nothing happens

Tried:
chat.cpp
[cpp] if(channelId == CHANNEL_TRADE)
{
player->sendToChannel(player, SPEAK_CHANNEL_W, "Here you can advertise all kinds of things. Among others, you can trade Tibia items, advertise ingame events, seek characters for a quest or a hunting group, find members for your guild or look for somebody to help you with something. It goes without saying that all advertisements must be conform to the Tibia Rules. Keep in mind that it is illegal to advertise trades including premium time, real money or Tibia characters.", CHANNEL_TRADE);
return NULL;
}[/cpp]
enums.h
[cpp] CHANNEL_TRADE = 0x06,[/cpp]

Result: Debug when opening channel selection window

Any ideas to make it work? :s