internal override void Apply(VisualElement container) { /// <sample> // Get a reference to the field from UXML and assign it its value. var uxmlField = container.Q <LayerField>("the-uxml-field"); uxmlField.value = 1; // Create a new field, disable it, and give it a style class. var csharpField = new LayerField("C# Field"); csharpField.SetEnabled(false); csharpField.AddToClassList("some-styled-field"); csharpField.value = uxmlField.value; container.Add(csharpField); // Mirror value of uxml field into the C# field. uxmlField.RegisterCallback <ChangeEvent <int> >((evt) => { csharpField.value = evt.newValue; }); /// </sample> }