How to redirect to other action inside view-state ?

HI all, i have a view-state:

Code:

---

<view-state>

                <transition on="REGISTER" to="buttonCheck"  >?????</transition>
               
                <transition on="ADD" to="xxx"></transition>

                <transition on="UPDATE" to="yyy"></transition>

</view-state>

---

I have a question, how i can do this thing ?

When i submit form with "REGISTER" action.
If "flowScope.button=='copy'", redirect to ADD action
If "flowScope.button=='change'", redirect to UPDATE action

Please help me how to do. Thank in advance!