How to access property using PropertyDrawer FindPropertyRelative

Questions & Answers
1

My data class

[Serializable]
public class Data<T>
{
    private T _value;

    public T Value
    {
        get => _value;
        set
        {
            _value = value;
        }
    }

    public EventVar(T value)
    {
        Value = value;
    }
}

How to show Value in the inspector using PropertyDrawer

[CustomPropertyDrawer(typeof(Data<>))]
public class DataUI: PropertyDrawer
{
    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
    {
        EditorGUI.BeginProperty(position, label, property);

        // Draw label
        position = EditorGUI.PrefixLabel(position, GUIUtility.GetControlID(FocusType.Passive), label);

        // Don't make child fields be indented
        int indent = EditorGUI.indentLevel;
        EditorGUI.indentLevel = 0;

        // Calculate rects
        Rect valueRect = new(position.x, position.y, position.width, position.height);

        // Draw fields - pass GUIContent.none to each so they are drawn without labels
        //EditorGUI.PropertyField(valueRect, property.FindPropertyRelative("Value"), GUIContent.none);

        Debug.Log(property.FindPropertyRelative("Value")); // This log null

        // Set indent back to what it was
        EditorGUI.indentLevel = indent;

        EditorGUI.EndProperty();
    }
}