ListView always popupates rows with new elements. That's why their
state is "cleared". You have two options:

1. call  listview.setReuseItems -> this will keep the old rows
2. if you need something more fancy and want to repopulate the rows,
you will need to use a "reusemanager" that can copy the component
states from the previous components:
http://old.nabble.com/Check%28box%29-loses-checked-state-after-error-td26079574.html

**
Martin

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