code: function(event_name) {
  
  		if (this._event_usage_counters[event_name] == 0) {
  			Lava.logError("ViewManager: trying to release an event with zero usage.");
  			return;
  		}
  
  		this._event_usage_counters[event_name]--;
  
  		if (this._event_usage_counters[event_name] == 0) {
  
  			this._shutdownEvent(event_name);
  
  		}
  
  	}
docs: Inform that event consumer does not need that event anymore
  @param {string} event_name