How to Add Dynamic Rows together with Non-Dynamic to a Single GridView Table

I have a Webform with a TextBox (Static) and 3 TextBox (Dynamic - based on the following article:

http://www.aspsnippets.com/Articles/Adding-Dynamic-Rows-in-ASP.NET-GridView-Control-with-TextBoxes-and-with-Delete-functionality.aspx )

How to use this scenario with a single GridView table?

Based on the User input, the GridView might have (1 + 3) columns; (1 + 6) columns; (1 + 9) columns; ...etc.

Thanks in advance.

Kibock