How to change the layer of the image in a group?

[William de Smet]

Hi there,
I have serveral images in a group and I want on dragging to change its
layer.
When not grouped it works fine: set the layer of me to 100
But when grouped I get an error: card not open or object in group.

How do I change the layer of the image in a group?

greetings,

William