function _showDayPicker(){

		var oDate = this._getFocusedDate();
		var iItems = this._getItems();
		var oDatesRow = this.getAggregation("datesRow");
		var oDateRange = oDatesRow.getSelectedDates()[0];
		oDateRange.setStartDate(CalendarUtils._createLocalDate(oDate, true));

		// set number of days - but max number of days of this month
		var oLastDayOfMonth = new UniversalDate(oDate.getTime());
		oLastDayOfMonth.setUTCDate(1);
		oLastDayOfMonth.setUTCMonth(oLastDayOfMonth.getUTCMonth() + 1);
		oLastDayOfMonth.setUTCDate(0);
		var iLastDay = oLastDayOfMonth.getUTCDate();
		var iDays = Math.floor(iItems * 1.5);
		if (iDays > iLastDay) {
			// to be limited on real month length by opening
			iDays = iLastDay;
		}
		oDatesRow.setDays(iDays);

		this.setProperty("_currentPicker", CURRENT_PICKERS.DATES_ROW);

		this._showOverlay();

		// set start date and focus date
		_setDateInDatesRow.call(this, oDate);

		this._iMode = 1;

	}
Shows an embedded day Picker.
This function assumes there is a "datesRow" aggregation.
So callers must take care.
@returns {void}
@private