public string HighlightImage;


using UnityEngine;
using Volplane;

public class Demo : VolplaneBehaviour
    void OnConnect(VPlayer player)
        // New element properties
        ElementProperties ep = new ElementProperties();
        ep.Image = "an-image.png";
        ep.HighlightImage = "a-highlight-image.png";

        // Apply element properties
        player.ChangeElementProperties("button", ep);

Sets the image of this element (must be a button or a swipe field). Specified image must exist in the img folder in the WebGL template: Assets/WebGLTemplates/Volplane/img/ (images and fonts in your controller).