[gst-devel] How can I catch the source of a message, sending one of my elements to the NULL state?

[wl2776]

I am manually building a pipeline.
One of its elements, a videosink, always falls the the NULL state.
My application doesn't send it there.

Several graphviz dumps, created during the pipeline contruction, and debug
messages from a bus watch, show that it changes states from READY to PAUSED,
from PAUSED to READY, and then suddenly, from PLAYING to NULL.

My application doesn't send the pipeline neither to the playing nor to the
NULL state by that moment. 
I'd like to catch, who does this (and thoroughly punish it :) )
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