I assume that you want to have your custom skin in the RadSpell dialog. If this is the case then you will need to get the latest version (2008.02.723). Custom skins for the editor/spell dialogs are not supported with version 2008.01.
In order to use your custom skin with the spell dialog, you need to do the following:
1) set the EnableEmbeddedSkins property to false
2) set the Skin property to the name of your skin
3) set the DialogsCssFile property to the location of your skin's CSS file. This is needed, because the RadSpell dialog is a separate document and it does not inherit the CSS styles from its parent page.
Here is an example:
|<telerik:RadSpell ID="RadSpell1" runat="server"
|Skin="customSkin" DialogsCssFile="~/customSkin.css" />
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