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I download your application and change your code, and now everything work fine.

I changed the connection in the config file so change it back to your settings.

Fill free to ask question if...

I didn't get into your code deeply but I think the concept shuold be changed.
When you bound the ComboBox to some object you should consider to bound it to object that implement...

I found the problem. I should create data template for each ListBoxItem as follow:

<ListBox Grid.Row="2" Grid.ColumnSpan="2" ItemsSource="{Binding Products}">
...

Hi

I have a class that contains customers details and their products (the products is an ObservableCollection of product type).

In my xaml I create a DataTemplate for my customer class as...