Enable SaveAction from the Properties TopComponent

Hi guys,

I'm facing an issues similar to the one described by Geertjan years ago in the post : https://blogs.oracle.com/geertjan/entry/undoredo_on_nodes_part_2

My application is based on RELEASE802. I defined an editor topcomponent (based on a DataObject + DataNode).
Some of the properties could be edited in the "Properties" view, some other directly in the main editor.

When the activated TopComponent is "Properties", Save, Undo, Redo, etc are disabled. All of them become enabled when I give the focus to the Navigator, Explorer view or to my main editor.

It seems the Properties is not working like others so I'd like to know if there is something special to do to have the SaveAction enabled from the Properties TopComponent?

Thanks,
Yann