Defines flow of the tabs. The .flow can be either 'up' or 'down' and define where tabs are pointing. You can defined it during object creation: let tabs = new w2tabs({ name: 'tabs', flow: 'up', tabs: [ { id: 'tab1', text: 'Tab 1' }, { id: 'tab2', text: 'Tab 2' }, { id: 'tab3', text: 'Tab 3' }, { id: 'tab4', text: 'Tab 4' } ] }); Or any time during run-time: w2ui.tabs.flow = 'down'; w2ui.tabs.refresh();