I have a ListView with several checkboxes contained that are loaded from a database. For just one of these checkboxes, I'd like to have a messagebox display when it is checked. I will then capture the answer to that question as data.

I would think I need to use a ListView.SelectedItem in the code-behind but this displays the messagebox only when the pertinent checkbox is the only box checked. I can get it so that the messagebox is displayed, but only if that checkbox is the only box checked. Also, the message will continue to display if I leave that box checked and check/uncheck other boxes. I don't want this. I need it to display only at the moment it's checked regardless of how many other boxes are checked.

So I changed it to .SelectedItems but this isn't working either. My current attempt is as follows:

XAML: 

<Grid>
	<ScrollViewer>
		<StackPanel Orientation="Vertical"><Label Content="STATS" />
			<ListView x:Name="lstStats" ItemsSource="{Binding Stats}" MaxWidth="684" MinHeight="25" Margin="0" BorderThickness="0">
				<ListView.ItemsPanel>
					<ItemsPanelTemplate>
						<WrapPanel Orientation="Horizontal" MaxWidth="650" />
					</ItemsPanelTemplate>
				</ListView.ItemsPanel>
				<ListView.ItemTemplate>
					<DataTemplate>
						<StackPanel Orientation="Vertical"  VerticalAlignment="Top">
							<StackPanel Orientation="Horizontal"  Grid.Column="1" VerticalAlignment="Top">
								<CheckBox x:Name="chkBox" IsChecked="{Binding RelativeSource={RelativeSource AncestorType=ListViewItem}, Path=IsSelected, Mode=OneWayToSource}" Margin="0,5,2,0" Content="{Binding Name}" />
							</StackPanel>
						</StackPanel>
					</DataTemplate>
				</ListView.ItemTemplate>
			</ListView>
		</StackPanel>
	</ScrollViewer>
</Grid>

Code-Behind:

Public Sub IsSelected(sender As Object, e As RoutedEventArgs) Handles lstStats.SelectionChanged
	Try
		Dim chkStats = New ObservableCollection(Of StatInfo)
		For Each item In lstStats.SelectedItems
			Dim selectItem As StatInfo = CType(item, StatInfo)
			If selectItem.Description = "Item Description to display MessageBox" Then
				Dim ask As MsgBoxResult = MsgBox("MessageBox text", MsgBoxStyle.YesNoCancel)
				If ask = MsgBoxResult.Yes Then
					sexCrimeStat.Stats.Add(New StatInfo With {.IsSelected = True, .Name = "Foobar", .Id = 25, .Description = "Item Description to display MessageBox", .Code = "Foo"})
					gotStat = True
				ElseIf ask = MsgBoxResult.No Then
	    			Exit For
				ElseIf ask = MsgBoxResult.Cancel Then
	    			Exit For
				End If
			End If
		Next
	Catch ex As Exception
		MessageBox.Show(ex.Message())
	End Try
End Sub

ViewModel:

Me.Stats = New ObservableCollection(Of StatInfo)() ' Load stats.
BindingOperations.EnableCollectionSynchronization(Stats, _statLock)
Dim tStats = DirectCast(App.Current, App).Db.GetStatItemsAsync.Result
If Not tStats Is Nothing Then
	For Each item In tStats
		If item.Active Then
			Me.Stats.Add(New StatInfo With {.IsSelected = False, .Name = item.Stat, .Id = item.Id, .Description = item.Description, .Code = item.AttributeCode})
		End If
	Next
End If