Hi Cold - re: show points - showing points does not work on solids where the surfaces of the solid are joined at trimmed edges rather than a natural edge of the underlying surface.

Please see this FAQ answer for a more detailed explanation and some illustrations that try to explain this issue.

Once you do an Edit/Separate on an object, you should then be able to turn on control points for the individual surfaces since they no longer have any joins to other surfaces.

If you have a problem with the Edit/Separate process, could you please post a file with just the one piece that will not cooperate in it? That would help me to examine the specific problem area.

One note - the points on stuff like the end caps of an extrude are typically a fair amount larger than the original outline, so if you are zoomed in close you may need to zoom out a bit to see the points for the cap's underlying surface.

Does that explain what you are mentioning? If not then I'll need a bit more specific information to understand.

- Michael