Reactivates a previously deactivated object, undoing the last state of the object.
HRESULT ReactivateAndUndo();
 This method supports the standard return values E_INVALIDARG, E_OUTOFMEMORY, and E_UNEXPECTED, as well as the following:
If the user chooses the Undo command before the Undo state of the object is lost, the object's immediate container calls IOleInPlaceObject::ReactivateAndUndo to activate the user interface, carry out the Undo operation, and return the object to the active state.
  Windows NT: Use version 3.1 or later.
  Windows: Use Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in oleidl.h.