Thanks for your reply.
Customer wants in the xml file format. Where they can edit the theme without VSB.
Any way i wrote a piece of code which will be converting all my xml theme files into a single xml theme file.
Format:-
<?xml version="1.0" encoding="utf-8"?>
<XmlTheme xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ThemeName="AliasDesert" ThemeVersion="2.0">
<StyleRepository>
<RepositoryItems>
</RepositoryItems>
</StyleRepository>
<BuilderRegistrations>
<XmlStyleBuilderRegistration> RadTextBox
</XmlStyleBuilderRegistration>
<XmlStyleBuilderRegistration> RadButton
</XmlStyleBuilderRegistration>
</BuilderRegistrations>
</XmlTheme>
Thanks.