Haven't looked at this properly but would it make more sense (in AddDetailRow()) to just add the created entity to the collection to which the grid is bound ?

>Anyone have any ideas on this?
>
>>Hi,
>>
>>I have a datagrid with two columns, one a dropdown/combo and the other a textbox for entering a value. Once a value is entered in the last row I want to automatically add another row to the datagrid and place the focus on the combo.
>>
>>This is the xaml for the grid:
>>
>>

                        <DataGrid AutoGenerateColumns="False" Grid.Row="1" Grid.Column="3" 
>>                                  Height="Auto" 
>>                                  HorizontalAlignment="Stretch" 
>>                                  Margin="0" 
>>                                  Name="grdAirWayBillDetails" 
>>                                  VerticalAlignment="Stretch" 
>>                                  Width="Auto" 
>>                                  IsSynchronizedWithCurrentItem="True" 
>>                                  ItemsSource="{Binding Mode=default}" 
>>                                  SelectionMode="Single" 
>>                                  GridLinesVisibility="None" 
>>                                  HeadersVisibility="Column" 
>>                                  Grid.ColumnSpan="2" 
>>                                 
>>                                  CanUserAddRows="False" 
>>                                  CanUserDeleteRows="False" 
>>                                  SelectionUnit="Cell" 
>>                                  Grid.RowSpan="4">
>>                            <DataGrid.Resources>
>>                                <Style x:Key="AlignRight" TargetType="DataGridCell">
>>                                    <Setter Property="HorizontalAlignment" Value="Right" />
>>                                    
>>                                </Style>
>>                                <Style x:Key="AlignRightHeader" TargetType="DataGridColumnHeader">
>>                                    <Setter Property="HorizontalAlignment" Value="Right" />
>>                                </Style>                            </DataGrid.Resources>
>>                            <DataGrid.Columns>
>>                                <DataGridComboBoxColumn Header="Charge Type" Width="2*" 
>>                                                        DisplayMemberPath="cty_name" 
>>                                                        SelectedValuePath="cty_pk" 
>>                                                        SelectedValueBinding="{Binding awd_ctyfk, Mode=Default}"/>
>>
>>                                <DataGridTextColumn Header="Amount" Width="*" Binding="{Binding awd_amount, Mode=default}"
>>                                                    CellStyle="{StaticResource AlignRight}"
>>                                                    HeaderStyle="{StaticResource AlignRightHeader}"/>
>>                            </DataGrid.Columns>
>>                        </DataGrid>

>>
>>This is my AddDetailRow() code:
>>
>>

        private void AddDetailRow()
>>        {
>>            AirWayBillDetailEntity entity = this.AirWayBillDetail.NewEntity(new AirWayBillDetailDefaults(this.AirWayBill.Entity.awb_pk));
>>
>>            // Select cell and begin edit
>>            this.grdAirWayBillDetails.CommitEdit();
>>
>>            this.grdAirWayBillDetails.Focus();
>>            System.Windows.Controls.DataGridCellInfo cellInfo = new System.Windows.Controls.DataGridCellInfo(entity, this.grdAirWayBillDetails.Columns[0]);
>>            this.grdAirWayBillDetails.SelectedCells.Clear();
>>            this.grdAirWayBillDetails.SelectedCells.Add(cellInfo);
>>            this.grdAirWayBillDetails.CurrentCell = cellInfo;
>>            this.grdAirWayBillDetails.BeginEdit();
>>        }

>>
>>This code causes the total of the amount column in the grid to get calculated:
>>
>>

        void AirWayBillDetail_StateChange(mmBaseBusinessObject bizObj, mmBusinessStateChangeEventArgs e)
>>        {
>>            if (e.State == mmBusinessState.Retrieved)
>>            {
>>                // Store the Air WayBill Detail in the DataGrid's data context
>>                this.grdAirWayBillDetails.DataContext = this.AirWayBillDetail.EntityList;
>>
>>                // Hide the new item row place holder in the Air WayBill Detail DataGrid
>>                ((IEditableCollectionView)CollectionViewSource.GetDefaultView(grdAirWayBillDetails.ItemsSource)).NewItemPlaceholderPosition =
>>                    NewItemPlaceholderPosition.None;
>>            }
>>            //this.ShowAirWayBillTotal();
>>            if (this.AirWayBillDetail.EntityList != null)
>>            {
>>                this.AirWayBillTotal = this.AirWayBillDetail.EntityList.Sum(x => x.awd_amount);
>>                foreach (var c in this.AirWayBillDetail.EntityList)
>>                {
>>                    c.PropertyChanged += CollectionItemChanged;
>>                }
>>            }
>>
>>        }

>>
>>This is what I have in my CollectionItemChanged:
>>
>>

        void CollectionItemChanged(object sender, PropertyChangedEventArgs e)
>>        {
>>            if (e.PropertyName == "awd_amount")
>>            {
>>                AirWayBillTotal = AirWayBillDetail.EntityList.Sum(x => x.awd_amount);
>>                OnPropertyChanged("AirWayBillTotal");
>>                AddDetailRow();
>>            }
>>        }

>>
>>What is happening now is that if I press Tab after entering an amount, a new row gets added, but focus goes to the next control in the tab order after the grid. So I have two questions:
>>
>>1. How to check if I'm on the last row?
>>
>>2. How to set focus to the combo?
>>
>>update:
>>
>>I have got a bit further with this using the PreviewKeyDown event and checking for Return, then calling my AddDetailRow(), but when I do this the combobox is not visible!