NLA Editor

Hi everybody i have a trouble with a blender file im working with for an animation.
In the NLA Editor i cannot see any object name on the gray bar on the left and no stripes/keys. I have set some keypoints for some objects, i see them in the timeline correctly.

I think i have done something that make the names and stripes disappear? Maybe some option activated without noticing? What might be my problem?

The selected object is in a different Layer, maybe?