How to set style on selected cells?

I'm using a sfDataGrid together with a custom StyleSelector because I need to apply some styles according to each cell contents. It works ok but when I select multiple cells, the SelectStyle method in the StyleSelector is not being called. So cells are being actually selected (I can copy them to clipboard and it works) but the selection is invisible, i.e. selected cells don't change its color. 

Hi, sorry for the delay answering.

public class CustomStyleSelector : StyleSelector      {          public override Style SelectStyle(object item, DependencyObject container)          {             var businessObject = item as BusinessObjects;              Style cellStyle1 = new Style(typeof(GridCell));  cellStyle1.Setters.Add(new Setter(GridCell.BackgroundProperty, newSolidColorBrush(Colors.YellowGreen) { Opacity = 0.2 }));                 Style cellStyle2 = new Style(typeof(GridCell));              cellStyle2.Setters.Add(new Setter(GridCell.BackgroundProperty, newSolidColorBrush(Colors.CornflowerBlue) { Opacity = 0.2 }));                 if (businessObject != null)              {                  if (businessObject.EmployeeGender == "Male")                      return cellStyle1;                  else                      return cellStyle2;              }              return base.SelectStyle(item, container);          }      }

var businessObject = item as BusinessObjects;  bool isSelected = dataGrid.SelectedItems.Contains(businessObject);

Jagadeesan

Thanks for your answer. I will dig my code a little more and try to isolate my issue, maybe I'm messing it up somewhere because  pivotGrid.SelectedItems is always empty, even in the datagrid_SelectionChanged handler. However if I hit "ctrl+C", contents of all "invisibly" selected cells get copied to the clipboard and I can paste them in Excel. So they are actually selected somewhere. Still, both inside datagrid_SelectionChanged handler and in the SelectStyle method, I see always 0 elements in pivotGrid.SelectedItems.