GUI code in this repository must be made portable between WPF and Avalonia. Hence, WPF dependency properties must be converted into styled properties, e.g.:

```
        public string Text
        {
            get { return (string)GetValue(TextProperty); }
            set { SetValue(TextProperty, value); }
        }

        public static readonly DependencyProperty TextProperty = DependencyProperty.Register("Text", typeof(string), typeof(SmartTextBox), new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));
```

should be converted to:

```
        public string Text
        {
            get => TextProperty.GetValue(this);
            set => TextProperty.SetValue(this, value);
        }
        
        public static readonly StyledProperty<string> TextProperty = PortablePropertyFactory<string>.Register<SmartTextBox>(nameof(Text));

```

PortablePropertyFactory.Register() is defined as follows:

```
public static StyledProperty<TValue> Register<TOwner>(string name, TValue defaultValue = default, PortablePropertyFlags flags = PortablePropertyFlags.None);

    [Flags]
    public enum PortablePropertyFlags
    {
        None = 0,
        IsTwoWay = 1,
        AffectsMeasure = 2,
        AffectsRender = 4,
    }
```

Whenever you encounter WPF properties that specify flags not covered by PortablePropertyFlags, or otherwise have behavior that cannot be directly translated here, leave original definitions unchanged, and add a line like this before the property declaration, even if it would cause a build error:

```
MissingFeatures.TODO("The <property name> cannot be made portable because <explanation why>");
```