Grid.RowSpan Attached Property
Gets or sets a value that indicates the total number of rows that child content spans within a Grid.
Assembly: System.Windows (in System.Windows.dll)
Dependency property identifier field: RowSpanProperty
Rows in a Grid are defined using the RowDefinition element. You can span across multiple rows and columns using the and Grid.ColumnSpan attached properties. The default value for both these properties is 1. The Grid will attempt to assign as many row spans or column spans as it can up to the amount specified by the or Grid.ColumnSpan properties. If the position of an element is such that implementing the declared column span or row span value is untenable, the Grid will attempt to achieve the next best solution. For example, consider a 2 by 2 grid structure that has a rectangle in the position (1,1) and the rectangle is set with a Grid.ColumnSpan of 2. Since a column is not available to the right of the rectangle for such a span to be displayed, the rectangle is constrained to a single column and the rectangle's ActualWidth may be less than the Width you may have specified.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.