gtk/gtk.go
func (v *Grid) InsertNextTo(sibling IWidget, side PositionType) {
	C.gtk_grid_insert_next_to(v.native(), sibling.toWidget(),
		C.GtkPositionType(side))
}
func (v *Grid) InsertNextTo(sibling IWidget, side PositionType) {
	C.gtk_grid_insert_next_to(v.native(), sibling.toWidget(),
		C.GtkPositionType(side))
}
// InsertNextTo() is a wrapper around gtk_grid_insert_next_to()