According to the Windows Applications Development with Microsoft .NET 4 70-511 Training Kit
What is the difference between the Label control and T
Label
T
Probably the most annoying feature of TextBlock is the implicit style lookup behavior, which is scoped to only to the closest DataTemplate. This is a default behavior for non Control xaml elements.
TextBlock
DataTemplate
Control
Yields a result of:
You can read more about it here.