How to change objects order in a container

Hello everyone, I started to modify the sampleUI module to try to put inside the textbox a button to tap…
my problem is that when i insert the button in the container it is no more touchable. Someone maybe know how to make some object in front of another one in a container? I’ve tried toFront() but it doesn’t works. Thanks

I’ve insert the button in the same group of the text and then button:toFront(). now is ok.