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I probably wouldn't even stick that line in the OnVisibleChange routine.  You are setting it visible in the OnItemSelected, and you are setting visibility to false when the video state is stopped or done.  You might want to add some error conditions for streams that fail to play to tidy up the possible exits from the playback routine.  If you want it to be visible=false on init then you can set that in the init function or in the xml.