Inadvisable registration: Generic types cannot be referenced from XAML. Create a non-generic type to be the owner of this AvaloniaProperty.

Converting null literal or possible null value to non-nullable type.

Converting null literal or possible null value to non-nullable type.

Dereference of a possibly null reference.

Converting null literal or possible null value to non-nullable type.

Converting null literal or possible null value to non-nullable type.

Converting null literal or possible null value to non-nullable type.

Inadvisable registration: Generic types cannot be referenced from XAML. Create a non-generic type to be the owner of this AvaloniaProperty.

Converting null literal or possible null value to non-nullable type.