The Picker is the window listing the controllers of a stacker (joints or IK targets only for the moment). That is the place to grab your controls!
By the way, depending on you are in the Animation or Rigging part the Picker handles some secondary features in specific contexts (Stacker Edit mode, Duo Skin process, skin locked influences, etc.).
- Select all controls of the current stacker.
- Select all left controls of the current stacker (left side naming convention).
- Select all right controls of the current stacker (right side naming convention).
- Select all the IK targets of the current stacker.
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When the current Stacker's Edit Mode is enabled, the Picker shows all the character's controllers, allowing you to add or remove them as you wish.
In this mode, the hammer icons (
) appear to indicate controllers belonging to the current stacker. Clicking on hammers allows you to add/remove controllers from the current Stacker.
| Please keep in mind that if you remove a controller from a stacker, the keys and associated transformations for this controller inside the stacker are deleted. Putting the controller back in the stacker will not restore these datas. If you really want to get them back, the only way is to "Undo" the removal of the controller. |
In Rigging part, the Picker has a few differences compared to its Animation counterpart:
) are a reminder of the locked/unlocked state for the Skin Atelier. Joints not featured in the Skin Atelier display a padlock to remind that their weights shall remain untouched, preventing any accidental modification. 
) is displayed on the current joint to indicate that weight color feedback in the 3D viewport is associated to this particular joint.