Processing tree from wizard

Hi.

A have a wizard with tree as certain step. Tree config: setSelectable(true) and setRowBasedObjectHandle(true).

I use MyOwnTreeNodeClass for tree nodes which extends NmObject and is not Persistable.

I want to get selected rows in action FormProcessor. But "List<ObjectBean> objectBeans" param in doOperation method contains all rows of tree and i see no way to determine which of them were selected (ObjectBean.getChecked() is empty).

NmCommandBean.getNmOidSelected contains selected in wizard windchill objects wrapped in MyOwnTreeNodeClass, but not the additional data i need.

How can i solve my problem?

Thanks.