I am using ExtJS 3.4 and display some checkboxgroups in an accordion panel.

When I save the checkboxgroup I want to access the checkboxes in a beforesave callback where I lookup the checkboxgroup and iterate over items.items which works so far but only if I iterate over a panel which was expanded. The collapsed panels have their items one level higher, so:

Expanded Panel => CheckboxGroup.items.items
Collapsed Panel => CheckboxGroup.items

Does anyone know why this happens?