This cool tutorial of Victor Gaudioso is about building a 3-column ListBox in Expression Blend.
Well, the project I was working on was a Silverlight project, not a WPF
project, and the current release of Silverlight does not contain a
WrapPanel. So now my clever solution was not a solution at all. After a
bit more research, I found that the Silverlight Toolkit does have a
WrapPanel. So, I was able to use that to make a three column
Silverlight ListBox. Today, I am going to show you how to use the
Silverlight Toolkit WrapPanel to create a three column ListBox.