TKTabView's layouts can position its tabs on the four edges of the view's bounds: top, left, right and bottom. To set the tabs position simply set the tabsPosition property:

this.tabView.setTabsPosition(TabsPosition.TOP);

Furthermore if the tabWidth property is set, and the total width of the available tabs is less than the available screen area, developers can set tabAlignment. The alignment can be left, right, top, bottom, center and stretch. For example:

this.tabView.getTabStrip().setTabsAlignment(TabsAlignment.CENTER);