#Expand / Collapse Row Details#
This example demonstrates how to expand / collapse the RowDetails of the GridView. 
Additional information about the Row Details Visibility feature can be found in the following articles:
WPF: http://www.telerik.com/help/wpf/radgridview-row-details-visibility.html   
SL: http://www.telerik.com/help/silverlight/radgridview-row-details-visibility.html