What kind of objects are they? What tool did you use to insert them in the model?   Based on your description I can't tell what is going on.   There are certain objects that are considered "container" objects. These include Symbols and Groups. In some cases depending on how they are written, Plug-in objects can also be containers. With container objects, both the class of the "container" and the class of the "contained" objects effects the visibility. If the container is not