In 1.5.0pre1 it was possible to see Invisible objects and sub-ordinate objects in the Solar System browser.
Since the, in trying to reduce clutter in the SSB, these Invisibles (and ReferencePoints) are no longer browsable.
However, in removing the Invisibles, the children also disappear from the browser.
These can now only be found by means of the ENTER menu, (which means they can only be found if their names are known to the user).
I think a way needs to be found to allow selected invisibles and ReferencePoints (or at least their sub-ordinate objects) to be browsable in the SS browser.
1. For most invisibles (which are just used for technical reasons to construct spacecraft and their components) it's probably good enough to show the object, but hide the placeholder.
2. For certain invisibles (eg. Lagrange Points) it's probably more appropriate to show them in the browser as well, because they have meaning and importance as "locations" in their own right and will likely in the future be parent to many children. -- IMO anyway ;-)
I suggested a "browse" property in this post: http://shatters.net/forum/viewtopic.php?p=98008#98008
... perhaps that's the solution.