Focus is not set in UserControl WPF

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C#

WPF

I cannot able to set focus on User Control Item
I am using DataGrid in User Control
I want to set focus on First row of DataGrid

I found following code

int index = 0;
     dgAccountInfo.SelectedItem = winAccountInfoGrid.dgAccountInfo.Items[index];
                    dgAccountInfo.ScrollIntoView(winAccountInfoGrid.dgAccountInfo.Items[index]);
                    DataGridRow dgrow = (DataGridRow)dgAccountInfo.ItemContainerGenerator.ContainerFromIndex(index);
      if (dgrow != null)
               dgAccountInfo.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));

By running above code I found ContainerFromIndex method always returns null


To rid of null problem I found following link
http://social.msdn.microsoft.com/forums/en-US/wpf/thread/ab95dd62-995f-481a-a765-d5efff1d559c/[^]


I come out of null problem using above link but still focus is not set on data grid

Thanks for reading my question