Right-to-Left Support
The RadRadioButtonList fully supports right-to-left (RTL) language locales (Figure 1). In order to turn on the RTL support, you should set dir=rtl to the html or body element or at least to its parent element (Figure 1). You can also use the direction:rtl CSS property.
<div style="direction: rtl">
<telerik:RadRadioButtonList runat="server" ID="RadRadioButtonList1">
<Items>
<telerik:RadioButtonListItem Text="יהודי" Selected="true" />
<telerik:RadioButtonListItem Text="גֶרמָנִיָת" />
<telerik:RadioButtonListItem Text="צָרְפָתִית" />
</Items>
</telerik:RadRadioButtonList>
</div>