Will DataGrid.ScrollIntoView work for you? The first parameter(item) is the element you want to show.

    //

    // Summary:

    //     Scrolls the System.Windows.Controls.DataGrid vertically and horizontally

    //     to display a cell for the specified data item and column.

    //

    // Parameters:

    //   item:

    //     The data item to bring into view.

    //   column:

    //     The column to bring into view.

    public void ScrollIntoView(object item, DataGridColumn column);