The Grid is the most powerful layout container in Silverlight. In fact, the Grid is so useful that when you add a new XAML document for a page in Visual Studio, it automatically adds the Grid tags as the first-level container, nested inside the root UserControl element.
The Grid separates elements into an invisible grid of rows and columns. Although more than one element can be placed in a single cell (in which case they overlap), it generally makes sense to place just a single element per cell. Of course, that element may itself be another layout container that organizes its own group of contained controls.
Tip Although the Grid is ...