WizardPanels of the Setup Wizard are defined as
instances on the SystemFS and there is no way how
to "reset" the instance once it was created apart
from waiting till it was garbage collected. The
sideeffect of this behaviour can be seen this way:
* open Options Dialog and check the value of WWW
Broser in System Settings
* open SetupWizard(SW) and check the value of WWW
Broser. The value should be same as in System
Settings (depends on the issue 31730 which I just
fixed)
* close the SW, modify value in System Settings to
some other browse and open SW

The SW may still contain the old value. The reason
is that panel (IDESettingsPanel) was not recreated
for the second opening of the SW, but the same
instance as in the first opening is still used. If
you force garbage collecting before opening SW
second time then everything is OK - the panel is
garbage collected and recreated (just add some
logging into IDESettingsPanel.finished() to see
when it is called and when not).

This is architecture problem I guess. Putting
instance of the WizardDescriptor.Panel into
systemFS is OK, but there is no method which could
be used to reset the instance instead of relying
on garbage collector. Possible hack could be to
use IntanceDataObject representing the instance
and use setValid(false) which should force its
recreation. 

FYI: this problem is not relevant for instances of
TemplateWizard.Iterator which has method
initiliaze() and uninitialize() which are used for
recreating of panels. But using of TW.I is not an
option here I guess.

Filing this for record, but marking it P4 - the
user should not stumble over it often. Should be
also solved by wizard redesign. Adding Yarda on
CC, he might have an idea.