Unity inherits Image simple component

Simply record
the reference article https://blog.csdn.net/duzixi/article/details/78013295
originally wanted to inherit the image, like the Sprite Swap type of Transition in the button, there is a gray image

public class SwapImage : Image
{
    
    

    public Sprite graySprite;

    public bool isGray;
   
}

But then I found that the editor does not display my public properties. After searching, I found out that I need the corresponding ImageEditor.

[CustomEditor(typeof(SwapImage))] 
public class SwapImageEditor : ImageEditor
{
    
    
    SerializedProperty graySprite;
    SerializedProperty isGray;

    protected override void OnEnable()
    {
    
    
        base.OnEnable();
        graySprite = serializedObject.FindProperty(nameof(SwapImage.graySprite));
        isGray = serializedObject.FindProperty(nameof(SwapImage.isGray));
    }

    public override void OnInspectorGUI()
    {
    
    
        base.OnInspectorGUI();
        // DrawDefaultInspector(); 
        serializedObject.Update();

        EditorGUILayout.PropertyField(graySprite);
        EditorGUILayout.PropertyField(isGray);
        serializedObject.ApplyModifiedProperties();
    }

}

Finally, I would like to ask, I want to refresh the UI when changing isGray, is there an easier way besides setting the picture in OnEnable Start OnValidate?