Class sap.ui.unified.Calendar to Class sap.ui.unified.Calendar.Header

  Hi,

     I'm currently devoloping project similar to example on SAPUI5 Explored (CalendarDateIntervalBasic).Everything works fine but ı need to reach

     pressNext and Previous events to understand months changing.

     I'm using Class sap.ui.unified.Calendar but pressNext and Previous events in  Class sap.ui.unified.Calendar.Header. How can I reach events in my        controller. ?

    Thanks in advance.

      pressNext(oControlEvent)Next button pressed

pressPrevious(oControlEvent)Previous button pressedevents.