Bug 67890 [PropertiesView] Exception when entries added to properties view
bundles/org.eclipse.ui.views/src/org/eclipse/ui/views/properties/PropertySheetViewer.java
return item;
        
        TreeItem[] items = item.getItems();
        for (int i = 0; i < items.length; i++) {
            TreeItem childItem = items[i];
            TreeItem findItem = findItem(entry, childItem);
            if (findItem != null)
                return findItem;
        }
        return null;
    }
    /**
     * Notifies all registered cell editor activation listeners of a cell editor
     * activation.
     * 
     * @param activatedCellEditor
     *            the activated cell editor
     */
    private void fireCellEditorActivated(CellEditor activatedCellEditor) {
        Object[] listeners = activationListeners.getListeners();
        for (int i = 0; i < listeners.length; ++i) {
            ((ICellEditorActivationListener) listeners[i])
                    .cellEditorActivated(activatedCellEditor);
        }
    }
    /**
     * Notifies all registered cell editor activation listeners of a cell editor
     * deactivation.
     * 
     * @param activatedCellEditor