It's not possible to change tab header text dynamically

[Sztub]

Replication steps:

1. Changing tab header text in code.
   TabView.ItemSource[2].HeaderText = "New Text that will be splited into multiple lines";
2. Switch between tabs.
   3.App is crashing

What i've also noticed, is that you cannot set binding into tab header text, when using prism.

[chaosifier]

With new TemplatedItemSource and ItemTemplate bindable properties, you could achieve what you're trying to do. Please look at the sample project for reference.