WPF resource nesting, one resource referencing another resource, the referenced resource should be declared in the previous

In WPF's XAML window.resources, one resource refers to another resource, and the following error occurs:

"Error 1" {Dependencyproperty.unsetvalue} "is not a valid value for the" System.Windows.FrameworkElement.FocusVisualStyle "property on the Setter.

Such as:

Although errors appear in the Error list, the missing program can still run, but the UI view (interface) is not visible in the designer.

This error occurs because:

The declaration of the referenced resource is behind the resource that references it (or there is no declaration of the referenced Resource).

Workaround:

Write the declaration of the referenced resource in front, such as:

In this way, you can see the beautiful interface in the XAML designer.

WPF resource nesting, one resource referencing another resource, the referenced resource should be declared in the previous