Unable to view base layers objects when creating a trigger

Hey guys! I have a slide that has 6 layers; each layer has a button. I'm trying to add a trigger to my base layer for my third button to go to my third layer; but for some reason, when I open the trigger wizard, it only shows objects on my 1st layer. I click on the object itself in the base layer, and it still won't let me add a trigger to it. I've attached a screen shot to hopefully show my predicament. 

I've only completed the first 2 layers; I have all the layers created, just not completed. 

Base LayerPlease help! I've tried pretty much everything. 

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