// FIXME: This is awkward... If I provide some
// non-boolean control input, I get obscure type
// conflict error messages and have to change this
// to match.
control.setExpression("true");
ParameterPort port = control.getPort();
// Put the control input on the bottom of the actor.
StringAttribute controlCardinal = new StringAttribute(port, "_cardinal");
controlCardinal.setExpression("SOUTH");
// Create the default refinement.