gtk/gtk.go
func (v *Grid) SetColumnSpacing(spacing uint) {
	C.gtk_grid_set_column_spacing(v.native(), C.guint(spacing))
}
func (v *Grid) SetColumnSpacing(spacing uint) {
	C.gtk_grid_set_column_spacing(v.native(), C.guint(spacing))
}
// SetColumnSpacing() is a wrapper around gtk_grid_set_column_spacing().