function _handleMousedown(oEvent, oFocusedDate, iIndex){

		if (oEvent.button) {
			// only use left mouse button
			return;
		}

		var bSelected = _selectMonth.call(this, oFocusedDate);
		if (bSelected) {
			this._bMousedownChange = true;
		}

		if (this._bMouseMove) {
			// a mouseup must be happened outside of control -> just end move
			_unbindMousemove.call(this, true);
			this._bMoveChange = false;
		} else if (bSelected && this.getIntervalSelection() && this.$().is(":visible")) {
			// if closed in select event, do not add mousemove handler
			_bindMousemove.call(this, true);
		}

		oEvent.preventDefault();
		oEvent.setMark("cancelAutoClose");

	}
@param {object} oEvent The fired event
@param {sap.ui.unified.calendar.CalendarDate} oFocusedDate The clicked date
@param {int} iIndex
@private