Use image as grid label

I’m working with a data column (yii\grid\DataColumn) for the gridview widget.

I want to configure the grid so that I can use an image as a label. Currently I can configure a column like so…

[

'attribute' => 'carspaces_garaged',


'header' => '<img src="/images/site/icons/car-sm-primary.gif">',    

],

This appears ok, however, it doesn’t enable a sorting link. It just returns the raw image.

If I do it like this:

[

'attribute' => 'carspaces_garaged',


'label' => '<img src="/images/site/icons/car-sm-primary.gif">',    

],

the sorting link works, but the label comes out as text and not html image. Does anyone know how I can configure an image and be able to use it as a clickable sorting link?