debinzhang Hmmm, as I answered first, I think your problem should be solved by enabling Show all skin attachments, but enabling it didn't solve it? It may seem like this is a view setting for the Tree view and therefore has nothing to do with the Dopesheet and Graph view, but in fact the view state in the Tree view has to do with which timeline is displayed on the Dopesheet and Graph view. Please let me know if you have tried this setting and if it worked.
