[gnoomen2]

I found this ShowPlayerDialog(playerid, -200, DIALOG_STYLE_MSGBOX, "Bye dialog", "Bye", "Bye", ""); its used on dialog id 200, but we are making it negative because that should hide the dialog. Dunno if it works, but you can make a timer do this after 30 sec have passed. Dunno if this negative thing will work, but you can try it out

So.. If the dialog id you want to hide is 50 use it like this:

ShowPlayerDialog(playerid, -50, DIALOG_STYLE_MSGBOX, "Bye dialog", "Bye", "Bye", "");