How to make sure my WPF TabControl always has a selected tab when it contains at least one tab?

I have a TabControl whose items are bound to an ObservableCollection:

<TabControl ItemsSource="{Binding MyObservableCollection}" />

The tabs are added and removed as expected as items are added and removed from the collection. However, the SelectedItem reverts to -1 (meaning there is no selected tab) whenever the collection is empty. Then, when an item is added, the SelectedItem stays at -1 and the new tab is not selected.

How do I make the TabControl select the new tab whenever an item is added to the empty collection?