Hello everyone!

I have a XamDataGrid which binds to a collection of custom objects, let's call it "FooItem". These objects has a property IsSelected.

With inspiration from Josh Smith's blogpost

(http://blogs.infragistics.com/blogs/josh_smith/archive/2008/09/04/adding-checkboxes-to-the-record-selectors-in-xamdatagrid.aspx)

, I have styled the RecordSelector and the HeaderPrefixArea as follows:

<Style TargetType="{x:Type DataPresenter:RecordSelector}">
         <Setter Property="Template">
            <Setter.Value>
               <ControlTemplate TargetType="{x:Type DataPresenter:RecordSelector}">
                  <CheckBox
                     x:Name="RecordSelectorCheck"
                     HorizontalAlignment="Center"
                     VerticalAlignment="Center"
                     IsChecked="{Binding Path=DataItem.IsSelected, UpdateSourceTrigger=PropertyChanged}"/>
               </ControlTemplate>
            </Setter.Value>
         </Setter>
      </Style>

<Style TargetType="{x:Type DataPresenter:HeaderPrefixArea}">
         <Setter Property="Visibility" Value="Visible"/>
         <Setter Property="Template">
            <Setter.Value>
               <ControlTemplate TargetType="{x:Type DataPresenter:HeaderPrefixArea}">
                  <CheckBox
                     HorizontalAlignment="Center"
                     VerticalAlignment="Center"
                     IsChecked="{Binding Path=DataPresenter.DataContext.IsAllItemsSelected, UpdateSourceTrigger=PropertyChanged}"/>
               </ControlTemplate>
            </Setter.Value>
         </Setter>
      </Style>

In my code-behind i have this eventhandler, which updates the IsSelected-property of all items when the user selects one or more records:

private void DataGrid_SelectedItemsChanged(object sender, Infragistics.Windows.DataPresenter.Events.SelectedItemsChangedEventArgs e)
        {
            (DataContext as FooViewModel).ClearSelectedItems();
            foreach (Record record in DataGrid.SelectedItems.Records)
            {
                ((record as DataRecord).DataItem as FooItem).IsSelected = true;
            }
        }

The datagrid is set to SelectionTypeRecord="Extended", SelectionTypeCell="None" and CellClickAction="SelectRecord".

When clicking(selecting) a record in the grid, also when multiselecting, the record gets selected, the FooItem's IsSelected-property is updated and the CheckBox in the relevant RecordSelector is checked. Seems to work fine!

BUT, when i go to the CheckBox and check/uncheck it, or if the IsSelected-property of the FooItems is updated from code due to the checkbox in HeaderPrefixArea is checked/unchecked, the DataGrid's selection is not updated, or the record's IsSelected is not updated. This results in the datagrid showing records as selected, but the RecordSelector-checkbox isn't checked and the underlying FooItem isn't selected.

Does anyone have a solution or a way I can make the DataGrid's selectedItems update when using the checkbox in the RecordSelector? Is there something i'm doing wrong?

Julian