'{DependencyProperty.UnsetValue}' is not a valid value for property 'FocusVisualStyle'

Question

I have a weird error I\'m trying to debug with no luck.

I have subclassed hwndhost showing some content, I have the following function in that class to set to fullsc

Answer 1

In case you got here by Googling the question title: Another way to cause this exception is to use a Trigger, but forget to set the Value.

Example:

This causes a XamlParseException where the inner exception reads:

'{DependencyProperty.UnsetValue}' is not a valid value for property 'IsEnabled'.

Correction: