Right-to-left Support
The RadSpell fully supports right-to-left (RTL) language locales. In order to turn on the RTL support you should set its DialogsCssFile property to an external CSS file in which you have the direction: rtl property set for the html or body element.
body
{
direction: rtl;
}
<div dir="rtl">
<asp:TextBox ID="TextBox1" runat="server" Height="100" TextMode="MultiLine">mizpelled conttent</asp:TextBox><br />
<telerik:RadSpell RenderMode="Lightweight" ID="RadSpell1" runat="server" ControlToCheck="TextBox1" DialogsCssFile="dialogsRTL.css" />
</div>