Thank you for using our services.
Sitefinity created pages do not exist in the file system. Data for Sitefinity pages is stored in the database your website is connected to and then when they are requested we construct them on the fly and serve them to the client. In this sense you cannot modify Sitefinity created pages in Visual Studio. The concept is to create controls which will handle your logic and then add them to the Sitefinity toolbox so that you can use your controls in Sitefintiy pages
All the best,
the Telerik team
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