http://msdn.microsoft.com/en-us/library/aa368048(v=vs.85).aspx

CostFinalize must be run before UI is displayed to allow Features to be
selected or Directories to be changed, which most installer UIs allow users
to do.

If you are changing properties that affect component/feature conditioning in
your UI, you can run CostFinalize again to have the installation states
reevaluated.  You just need to execute the CostFinalize action from a
DoAction control event after the appropriate property values have been set.

-Mike
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