Set the image of button to the given widget. The image will be displayed if the label text is NULL or if always-show-image is TRUE. You don’t have to call Widget.show on image yourself.
a widget to set as the image for the button, or NULL to unset
2.6
Set the image of button to the given widget. The image will be displayed if the label text is NULL or if always-show-image is TRUE. You don’t have to call Widget.show on image yourself.