Must be marked as Child

[CrossSlide]

I have a BO that has a child collection that is bound to a GridControl and the data is retrieved without a problem. When I go to the bottom of the grid and add a new item the grid shows it’s in edit mode but as soon as I type a keystroke it bombs with “List item must be marked as a child object”.

I’ve tested my BO and I can add a new record without error, (var nw =BO.MyColl.AddNew(); nw.MyField = “test”; BO.Save()). During testing both the BO.MyColl.IsChild and nw.IsChild return true. So I think this proves my BO is setup correctly.

Anyone know what I'm doing wrong? Thanks

<DataGrid ItemsSource="{Binding Model.MyColl}" AutoGenerateColumns="False" > <DataGrid.Columns> <DataGridTextColumn Binding="{Binding MyField}"/> </DataGrid.Columns> </DataGrid>

Error:
System.Reflection.TargetInvocationException: 'Exception has been thrown by the target of an invocation.'
InvalidOperationException: List item must be marked as a child object

CSLA: v4.6
WPF MVVM: CSLA ViewModelBase

[CrossSlide]

For future newbies there is no add new concept in WPF...

[rockfordlhotka]

There is a workaround (typically) however, in that you can handle the UI control's event indicating that it would like to add a new item and then you can add it via mycollection.AddNew(). It is a bit messy, and it would be better if the WPF datagrid used the data binding interfaces properly...

[CrossSlide]

Thanks Rocky! @rockfordlhotka