Compound Components & Z-Order

Two separate questions...

1) Can components be compounded Can one component be the parent of another We know that you can add components to Games via the designer, but what about adding components to others via the designers I thought I saw this but I cannot seem to get it to work. I have a component called Console and wish to add another "Sprite" component to it. No components show up in the toolbox however.

2) How are we supposed to define Z-Order. I want my Console class to display on top of everything else but can find no way to garuntee that this happens. Will this change in the future