The sex-links are often more docile, more "friendly" than many other breeds. Since they're bred for egg production, it's a useful quality for them to have, to be compliant around their human caregivers.
The best thing is to give them every opportunity to associate you with Good Things. Give them kind & gentle care, handle them with TLC, don't make sudden moves or grab them too tight. Get them used to your presence, starting with just putting your hand in their box and leaving it there until they lose their panic.
As they get older you can start bringing them treats occasionally. It won't take them long to associate The Hand with Tasty Treats. Make up a call signal so they will learn to come when you make that sound.
They will be more likely to come when called if you DON'T give them a treat EVERY time. It's the same response that hooks gamblers, not knowing just when the payoff will come.
Enjoy your birds, I think the sex-links are wonderful hens & reliable layers.