Calendar: How to customize displayed date range

Hi everyone:
I was trying to use the Calendar widget provided by smart gwt. I need a particular functionality, to choose a particular date range( For example, display all the days between may and july)(By default it displays only a month, week or a day). I was trying to use the method setTimeLineRange, however it does not seems to work. Does anyone know a way to customize the date range? Any way here is the code:

    this.calendar = new Calendar();
    this.calendar.setCanDeleteEvents(false);
this.calendar.setData(getNewRecords());
this.calendar.setCanCreateEvents(false);
this.calendar.setTimelineRange(start, end);
	
absolutePanelHolidayGrid.add(this.calendar, 6, 6);