Setting master-detail positions programmatically

I have two DataGridViews with a master-detail relationship. I need to change the current item in both of them programmatically. I tried the following code:

    void SetMasterDetailPositions(int masterId, int detailId)
    {
        var masterPosition = masterBindingSource.Find("id", masterId);
        if (0 <= masterPosition)
        {
            masterBindingSource.Position = masterPosition;
            var detailPosition = detailBindingSource.Find("id", detailId);
            if (0 <= detailPosition)
            {
                detailBindingSource.Position = detailPosition;
            }
        }
    }

but I got an exception on this line:

        var detailPosition = detailBindingSource.Find("id", detailId);

The exception says:

System.ArgumentException occurred
  HResult=0x80070057
  Message=DataMember property 'id' cannot be found on the DataSource.

In short, I managed to change the current item in the master grid but not in the detail grid. Why am I getting this exception?