// constractors
public ChatRoom(string url)
{
this.url = url;
this.currUser = null;
presMsgs = new List <GuiMessage>();
sort = new SortByTime();
filter = new string[3];
filter[0] = "NONE";
filter[1] = "";
filter[2] = "";
// initialize the messages handler with a default filter - NONE
HandlerFactory handler = new HandlerFactory();
allMessages = handler.createMessageHandler();
allUsers = handler.createUserHandler();
allMessages.filterByNone();
updatePresMessages();
}