Some objects show transformation curves in Curves Editor and some do not.  Two of the objects I have were models imported from 3DXchange - sub tools from the same .obj file.  Both have transformations in the timeline.  One of the objects shows curves in Curves Editor, and the other does not.  I have other objects in the file, and it seems quite random which of them actual show transformation curves.  A car and bulldozer do not.  A dump truck does.  All have similar transformations in the timeline.  I am stumped.