WPF tab control and MVVM selection

Question

I have a TabControl in an MVVM WPF application. It is defined as follows.

Answer 1

Just FYI, I gone through the same issue where I add tabs dynamically using ObservableCollection source but last added Tab do not get selected. I have done same changes what Sheridan said to select Tab as per SelectedIndex. Now last added Tab gets selected but it was not getting focused. So to focus the Tab we have to add set Binding IsAsync property True.