public WOActionResults toExcel() {
ListPageInterface lpi = (ListPageInterface) D2W.factory().pageForConfigurationNamed("ListExcelCategory", session());
EOArrayDataSource ds = new EOArrayDataSource(null, session().defaultEditingContext());
ds.setArray(((ERD2WListPage)ERD2WUtilities.parentListPage(this)).displayGroup().allObjects());
lpi.setDataSource(ds);
return (WOActionResults)lpi;
}
seems to work great.