click on the design icon(ruler) on Sidekick, your page will refresh and the layout changes (your sidekick will collapse)..
click on 'edit' of parsys of your page which will pop out a dialog showing the components
that you can able in your sidekick. Enable the component or category (tick the checkbox) and come back to edit mode
by clicking your 'Sidekick' to return to normal ... you can also find the category/group of that component from crxde
by inspecting the properties of that component.
- Venu Gummadala