grid cell down not show image

I'm trying to show in image in a grid cell. I searched google and mostly found the advice using the renderer. I'm using the architect (Version 3.1) and the renderer of this cell looks like:

return '\<img style="width:60px;height:60px" src="resources/images/attention.gif"/\>';

But the page won't show the image and in the devtools the corresponding element looks like a text element. The text is shown instead.

How do I instruct the architect to create an image element?

grid cell down not show image