code: public void datePickerInit(String prevMonthLocator, String nextMonthLocator, String dateTextLocator) {
          this.prevMonthLocator = prevMonthLocator;
          this.nextMonthLocator = nextMonthLocator;
          this.dateTextLocator = dateTextLocator;
      }
docs: DatePicker comes with default locators for widget controls previous button, next button, and date text. This
  method gives access to override these default locators.
  
  @param prevMonthLocator
  calendar widget prev month
  @param nextMonthLocator
  calendar widget next month
  @param dateTextLocator
  calendar widget month and year text