Create TZConneciton in run time

Good afternoon
I'm using Delphi 7 with ZEOS. I need to create a connection in RUN TIME. I'm trying to use the following code

Var
  Connection : TZConnection;
begin    
    Connection:= TZConnection.Create(Nil);
    Connection.HostName:= '127.0.0.1';
    Connection.Database:= 'RMS';
    Connection.Password:= '1111';
    Connection.User:= 'root';
    Connection.Port:= 3306;
    Connection.Protocol:= 'mysql-4.1';
    Connection.LoginPrompt:= False;
    Connection.TransactIsolationLevel:= tiReadCommitted;

But for some reason the line

  

Connection.TransactIsolationLevel: = tiReadCommitted;

This is returning me the following error

  

[Error] Unit1.pas (719): Incompatible types:   'TZTransactIsolationLevel' and 'TTransIsolation'

My question is ..:
I have to declare something in USES to be able to SET the Connection.TransactIsolationLevel via programming or via programming really not to set this property ??
At design time I can connect and change the above-mentioned property normally.
Hugs and thanks to everyone for the attention.