RadPdfViewer provides support for right-to-left presentation.
RadPdfViewer considers the direction attribute set to the control itself or any parent
HTML element. If you set the direction of the body tag (or any other parent element
that contains the control) to rtl, RadPdfViewer applies the set direction to all tools inside its toolbar.
<telerik:RadPdfViewer ID="RadPdfViewer1" runat="server" dir="rtl" ... />