In the code samples above we show how you could attach RadSpell to almost all of
the HTML editable elements: textarea, div, etc. Again you have to use the ControlToCheck
property, but since this time the spellchecker is launched client-side you also
have to set the IsClientID property to "true".
e.g.
<telerik:RadSpell id=spell1 ButtonCssClass="button" IsClientID="true" ControlToCheck="textarea1" Runat="server"></telerik:RadSpell>