Maintain scroll position in datagrid after edit: Silverlight and c#

See more:

Silverlight

DataGrid

Using Silverlight and c#:
I have a datagrid having PropertyGroupDescription added to it and also have Item templates in it.. If I edit a row which is exist in the middle of the grid..after saving that data by using that save button in the panel...what happened is the data grid rebinding and the pointer goes to the first record in the datagrid. I want the scroll to maintain its position to the row which is edited after its ItemSource is changed. I tried using ScrollIntoView as follows:

tblSessionDataGrid.SelectedItem = objSelectedItem;
tblSessionDataGrid.CurrentColumn = tblSessionDataGrid.Columns[0];
tblSessionDataGrid.ScrollIntoView(objSelectedItem, tblSessionDataGrid.Columns[0]);

objSelectedItem holds the recently edited Item.
But its now working. Can anyone please suggest where I am going wrong?