I need a dialog with absolutely no border

["Kevin Lambert" <kl lapis com>]

I am using Glade-3 to create a dialog which only has a button and that
button has an image assigned to it.  What I need is for the image to take up
the entire screen without a border.  What I am finding is that GtkDialog
seems to force a 2-3 pixel border around the entire image.  Is there any way
to get rid of that border?

Thanks,
Kevin