Binding to a BindableCollection inside of a custom object WPF + Caliburn.Micro - wpf

Question

I have a class Item that has a property of type BindableCollection named Children. Each Child has different information that I need to display, here's an example.
Public Property CurrentItem() As ObservableCollection(Of ItemModel)
'Used for displaying all item information
'Will only hold one item
Get
Return _currentItem
End Get
Set(ByVal value As ObservableCollection(Of ItemModel))
_currentItem = value
NotifyOfPropertyChange(Function() CurrentItem)
NotifyOfPropertyChange(Function() ItemsChildren)
End Set
End Property
Public Property ItemsChildren() As BindableCollection(Of ChildModel)
Get
If CurrentItem.Count > 0 Then
Return CurrentItem(0).Children
Else
Return New BindableCollection(Of ChildModel)
End If
End Get
Set(ByVal value As BindableCollection(Of ChildModel))
_itemChildren = value
End Set
End Property
XAML
<!-- Child Info DataGrid-->
<DataGrid ItemsSource="{Binding Path=ItemsChildren}" Grid.Row="3" Grid.ColumnSpan="2" Margin="10" AutoGenerateColumns="False" AlternatingRowBackground="Gray" CanUserAddRows="False" HorizontalAlignment="Stretch">
<DataGrid.Columns>
<DataGridTextColumn Header="Child" Binding="{Binding Path=ChildItem}" />
<DataGridTextColumn Header="Name" Binding="{Binding Path=ItemName}" />
<DataGridTextColumn Header="Assy" Binding="{Binding Path=Assembly}"/>
<DataGridTextColumn Header="Balloon Number" Binding="{Binding Path=BallNo}"/>
<DataGridTextColumn Header="Link Text" Binding="{Binding Path=LinkText}"/>
<DataGridTextColumn Header="Qty" Binding="{Binding Path=Quantity}"/>
</DataGrid.Columns>
</DataGrid>
ChildModel is just a class that has properties for the values in the datagrid
Both CurrentItem's NotifyOfPropertyChange do not get run when add items to CurrentItem, so ItemsChildren is not being updated. How can I force NotifyOfPropertyChange?

Answer 1

Not sure if this will work, but in your code CurrentItem is an ObservableCollection(of ItemModel). Because CurrentItem will only ever hold a single value, then it should be:
Public Property CurrentItem() As ItemModel
'Used for displaying all item information
'Will only hold one item
Get
Return _currentItem
End Get
Set(ByVal value As ItemModel
_currentItem = value
NotifyOfPropertyChange(Function() CurrentItem)
NotifyOfPropertyChange(Function() ItemsChildren)
End Set
End Property
This should fire the NotifyOfPropertyChange() when the selection from the datagrid changes. In your XAML, you will also need to add a SelectedItem property:
<DataGrid ItemsSource="{Binding Path=ItemsChildren}" SelectedItem="{Binding Path=ItemModel, Mode=TwoWay}" Grid.Row="3" Grid.ColumnSpan="2" Margin="10" AutoGenerateColumns="False" AlternatingRowBackground="Gray" CanUserAddRows="False" HorizontalAlignment="Stretch">
Hope this helps.