let splitPaneLeftSideElement = document.getElementsByClassName('Pane1');
if (splitPaneLeftSideElement.length > 0) {
let width = splitPaneLeftSideElement[0].offsetWidth;
let splitPaneLeftSideElement = document.getElementsByClassName('Pane1');
if (splitPaneLeftSideElement.length > 0) {
let width = splitPaneLeftSideElement[0].offsetWidth;