No items are available. Maybe upload some stuff?
Also if you want to animate the Peacekeeper after rigging the model, just click on the cog on the upper-right of the animation set editor and tick 'Show Hidden Controls'. You can animate other hidden objects too, like the hat.
You can enable the Peacekeeper model by right-clicking the animation set and selecting 'Peacekeeper.smd' under 'Set Body Groups'.