Icon of icon field in the filtering row!

[tleveque]

Hi

I have implemented my own delete column for a listGrid (because I needed to have a confirmation box before deleting).
I am using:
lDeleteField.setType( ListGridFieldType.ICON );
lDeleteField.setCellIcon( this.getRemoveIcon() );

But the problem is that the delete icon now appear in the filtering row!! (see the attached image)
Is there a way to remove it?
I really think it is a bug. I cannot see why an icon should appear in the filtering row.