internal override void Apply(VisualElement container)
{
/// <sample>
// Get a reference to the field from UXML and assign it its value.
var uxmlField = container.Q<Vector4Field>("the-uxml-field");
uxmlField.value = new Vector4(23.8f, 12.6f, 88.3f, 92.1f);
// Create a new field, disable it, and give it a style class.
var csharpField = new Vector4Field("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<Vector4>>((evt) =>
{
csharpField.value = evt.newValue;
});
/// </sample>
}