I have an image in a grid cell and I want to show the enlarged image as tooltip. It should be possible with "setDescriptionGenerator". I tried the following:

```java
grid.addComponentColumn(probe -> {
            Image image = new Image("", new ThemeResource("img/" + probe.getImage()));
            image.setWidth(35, Unit.PERCENTAGE);
            image.setHeight(35, Unit.PERCENTAGE);

            return image;
        }).setCaption("Structure").setDescriptionGenerator(probe -> {
            Image image = new Image("", new ThemeResource("img/" + probe.getImage()));

            return image;
        });

```

But I get the error that I cannot return an image. It seems that with "setDescriptionGenerator" I can only set a String. Is it possible to write a custom description generator? Please give me an example.

Thank you for your help!