event field with multi page

hi
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i create multi page form
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in my page 7 i have radio with 2 choice
label your choice, with value 1 or 2
and submit
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in my page 8 i have 2 containers
first for choice 1
second for choice 2
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in parameter of first container in interface i add : HIDDEN and Event
event :
shown if page7- your choice equals 1
hide id page7 - your choice not equals 1
​
in parameter of second container in interface i add : HIDDEN and Event
event :
shown if page7- your choice equals 2
hide id page7 - your choice not equals 2
​
but when i submit page 7 i have nothing
​
i loose my value of my radio when i submit ?
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can you help me
thanks
stephan