fnGetItemSize = function (oItem) {
									 if (oItem.getDomRef() && oItem.getDomRef().parentElement) {
										return oItem.getDomRef().parentElement.offsetWidth
										+ parseFloat(getComputedStyle(oItem.getDomRef().parentElement).marginLeft)
										+ parseFloat(getComputedStyle(oItem.getDomRef().parentElement).marginRight);
									 }
								}
This event is triggered on pressing the scroll button.