http://udn.epicgames.com/Three/UsingPrefabs.html
The section
Either the Button P has been replaced, or moved, as the Current "P" changes perspectives, from Front to Side, to Perspective...
The section
Editing A Prefab
By default, when you click on any Actor within a Prefab instance it selects the whole instance. This is to make working with prefabs easier, as you can then move them around as one unit. However, you sometimes want to edit a particular Actor within a Prefab. To do this, press the Prefab Lock button on the toolbar, which looks like a letter P.
By default, when you click on any Actor within a Prefab instance it selects the whole instance. This is to make working with prefabs easier, as you can then move them around as one unit. However, you sometimes want to edit a particular Actor within a Prefab. To do this, press the Prefab Lock button on the toolbar, which looks like a letter P.
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