Spread for ASP.NET 12 Product Documentation
Spread Designer
Spread for ASP.NET 12 Product Documentation > Developer's Guide > Understanding the Product > Features Overview > Spread Designer

You can use the Spread Designer to design your component and to create a prototype quickly. Use the Spread Designer to reduce development time by allowing you to customize the look and feel of the component at design time using an intuitive, easy-to-use interface.

For more information refer to Working with the Spread Designer.