XamlParseException Failed to assign to property. Binding not working with attached property

Question

I want to create custom text box with attached property for Windows Store app. I am following this solution. Now it uses hard coded value as property value but I want to set

Answer 1

This is a pretty common mistake. The problem is, binding targets cannot be CLR properties in XAML. It's just the rules. A binding source can be a CLR property, just fine. The targets simply must be dependency properties.

We all get the error! :)

I describe the whole thing here: http://blogs.msdn.com/b/jerrynixon/archive/2013/07/02/walkthrough-two-way-binding-inside-a-xaml-user-control.aspx

Best of luck.