Create a new button inside rollout

Hi everybody, I have a noob question here.
Can i create a new button inside of my rollout or group?
I need create a new button inside the same rollout when pressed other button. Can i make this?

This is my sample:

try (destroydialog :: prueba ) catch()
rollout prueba "Testing Buttons"
(
group "Buttons"
(

button bt1 "More+" across: 3
button bt2 "Remove-" enabled:false
button bt3 "New" visible:false

)
on bt1 pressed do(
bt3.visible=true
bt2.enabled=true
)
on bt2 pressed do(
bt3.visible=false
bt2.enabled=false
)
)
createDialog prueba 180 60

This solution is ok, but i need create button not hide =/