HistoricalDataBroker now uses ObservableDictionary to hold the data sources.
HistoricalDataBroker now uses ObservableDictionary to hold the data
sources.

leo90skk/qdms,leo90skk/qdms,qusma/qdms,qusma/qdms,underwater/qdms,Jumaga2015/qdms,KBurov/qdms,underwater/qdms