Question

How do I use RelativeSource with WPF bindings and what are the different use-cases?

Answer 1

If you want to bind to another property on the object:

{Binding Path=PathToProperty, RelativeSource={RelativeSource Self}} 

If you want to get a property on an ancestor:

{Binding Path=PathToProperty,     RelativeSource={RelativeSource AncestorType={x:Type typeOfAncestor}}} 

If you want to get a property on the templated parent (so you can do 2 way bindings in a ControlTemplate)

{Binding Path=PathToProperty, RelativeSource={RelativeSource TemplatedParent}} 

or, shorter (this only works for OneWay bindings):

{TemplateBinding Path=PathToProperty}