RadComboBox for ASP.NET AJAX
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RadControls for ASP.NET AJAX

RadComboBox provides support for locales that read right-to-left. All you need do to achieve a RTL look and feel is mark the RadComboBox instance with dir="rtl".

CopyASPX
<telerik:radcombobox 
    id="RadComboBox1" 
    runat="server" 
    height="140px" 
    skin="Default"
    width="150px" 
    contentfile="~/App_Data/combobox.xml" 
    showtoggleimage="True" 
    dir="rtl">
</telerik:radcombobox>

This definition results in the following appearance:

ComboBox RTL

See and online demo of the RTL support at Right-to-Left Support.