Telerik Silverlight GridView click events

// Single click
this.TradesGrid.SelectionChanged += TradesGridSelectionChanged;
            
// Double click
this.TradesGrid.AddHandler(GridViewCellBase.CellDoubleClickEvent,
                            new EventHandler<RadRoutedEventArgs>(OnCellDoubleClick), true);
 
......

void TradesGridSelectionChanged(object sender, SelectionChangeEventArgs e)
{
    if (e.AddedItems.Count == 0) return;
 
    var trade = e.AddedItems[0] as Trade;
    if (trade == null) return;
 
    var vm = DataContext as ViewModel;
    if (vm == null) return;
 
    vm.OpenTradeForDocumenting(trade);
}
 
private void OnCellDoubleClick(object sender, RadRoutedEventArgs e)
{
    var cell = e.Source as GridViewCell;
    if (cell == null) return;
  
    var row = cell.ParentRow as GridViewRow;
    if (row == null) return;
 
    var trade = row.DataContext as Trade;
    if (trade == null) return;
 
    var vm = DataContext as ViewModel;
    if (vm == null) return;
 
    vm.OpenTradeForDocumenting(trade);
}