Read original post by Michael Washington at LightSwitch Help Website
Visual Studio LightSwitch allows you to create Group extensions. A Group extension allows you to specify the layout of controls contained in the group.
Microsoft has an article, Walkthrough: Creating a Stack Panel Control Extension, that covers the basics of creating a Stack Panel extension for LightSwitch. That article creates an extension that preforms the same functionality as the Rows Layout control that comes in LightSwitch. This article will cover creating an extension that groups controls in a border with a shadow.