The parameter object is TDataGatewayResultEventParameter of which the
{@link TDataGatewayEventParameter::getResult Result} property contains
the data return from the database. The data returned can be changed
by setting the {@link TDataGatewayEventParameter::setResult Result} property.
Note well that the finder objects obtained from ActiveRecord::finder()
method are static objects. This means that the event handlers are
bound to a static finder object and not to each distinct active record object.
