WPF: How do I debug binding errors?

Question

I\'m getting this in my output Window:

System.Windows.Data Error: 4 : Cannot find source for binding with reference \'RelativeSource FindAncestor, Ancesto

Answer 1

I ran into a similar problem with the TreeView (though my data binding errors showed up as being Informational).

I solved the problem by defining an implicit style in the TreeView resource for TreeViewItem. Within that style I defined the missing vertical and horizontal content alignment properties.