Cycle through instances

Sorry if this has been answered, but is there a way to cycle through the instances in a scene without clicking on them. Like say I have several invisible instances or just to many layers, is there a way to cycle through them using a keyboard?
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Inspector Game|Scene
Click on Scene
click the arrow next to "Background"
this will show a list of all the instances in that scene... clicking any one will highlight it on sceneDisplay
double-clicking an instance in the list will give you access to edit that instance...
clicking the ( + ) at the bottom creates a new layer in a scene
all layers with their content are also accessible..
MH