Binding in nested layout

In my project I have the following structure

• TabbedPage main page
• ContentPage child page within there
• Map within the child page

On the Map, I have a property called "Hike". On the TabbedPage I set the DataContext to an object of type Hike.

Question: What binding statements do I use (in C#, not XAML) in order to bind the Map.Hike property to the datacontext of the containing TabbedPage?