gtk/tree_view.go
func (v *TreeView) SetGridLines(gridLines TreeViewGridLines) {
	C.gtk_tree_view_set_grid_lines(v.native(), C.GtkTreeViewGridLines(gridLines))
}
func (v *TreeView) SetGridLines(gridLines TreeViewGridLines) {
	C.gtk_tree_view_set_grid_lines(v.native(), C.GtkTreeViewGridLines(gridLines))
}
// SetGridLines is a wrapper around gtk_tree_view_set_grid_lines().