Java POS Config Loader

I was working changing values for properties and
noticed that sometimes the value
was not updated to a valid representation when I
changed the type. i.e, If I updated
from any type to boolean, the value for that property
will be updated to "false" as
soon as I select boolean. If I change from boolean to
a numeric type (long) the value
is not updated when I select the type until I click
the value which will be updated 0x0.
I do not know if it is possible to update the
property value to a valid representation
when I change the type instead have to click on the
property to get its new valued.