func (v *Widget) SetMarginBottom(margin int) {
	C.gtk_widget_set_margin_bottom(v.native(), C.gint(margin))
}
func (v *Widget) SetMarginBottom(margin int) {
	C.gtk_widget_set_margin_bottom(v.native(), C.gint(margin))
}
// SetMarginBottom is a wrapper around gtk_widget_set_margin_bottom().