TabPanel Right to Left
Some languages render content from the right to the left of the page(Arabic and Hebrew are typical examples). HTML accommodates this with the 'dir' attribute. Setting 'dir' to 'rtl' on any element causes the element's content to flow from right to left.
The TabPanel supports this automatically. If the element hosting the control has the 'dir' attribute set to 'rtl', the panel will render with tabs aligned from right to left. You don't have to set any properties on the control.
Note that the 'dir' attribute value is inherited, so if you set it on the body tag for example, the entire page will be rendered from right to left, including the TabPanel.
Note also that CSS has a 'direction' attribute that performs the same function as the 'dir' element attribute. The 'dir' attribute is generally considered more appropriate for several reasons, including the fact that it can be used in CSS rules.