Hi Florian,

I've had some issues with that property as well. The utility method below might be somewhat redundant for the next release (7.2 Beta is over 2 months old, if I recall correctly), but does it's job ok for now:

    /// <summary>
    /// Selects and activates a given record of a grid.
    /// </summary>
    public static void SelectRecord(XamDataGrid grid, Record record)
    {
      //remove current selections
      grid.SelectedItems.Records.Clear();

      grid.ActiveRecord = null;
      grid.ActiveRecord = record;
      record.IsSelected = true;
    }

    /// <summary>
    /// Select the <see cref="DataRecord"/> that represents a given
    /// data item.
    /// </summary>
    /// <param name="grid">The grid to be processed.</param>
    /// <param name="dataItem">The bound item to look for.</param>
    /// <returns>True if the grid provides any records which could be
    /// selected. If the grid is empty, false is returned.</returns>
    public static bool SelectRecordForItem(XamDataGrid grid, object dataItem)
    {
      DataRecord record = grid.GetRecordFromDataItem(dataItem, false);
      if (record != null)
      {
        SelectRecord(grid, record);
        return true;
      }
      else
      {
        return false;
      }
    }

Hope it'll work. Cheers!

Philipp