How does one disable the horizontal control bar of the Tree control node?

v4.2.2.stable.official

Question

Is this a bug? Or am I doing something wrong?

I made sure the tree item has autowrap mode set to 3

Here is the code:

	var tree = $Tree;
	var root = tree.create_item()
	var message = tree.create_item(root)
	tree.scroll_horizontal_enabled=false;
	message.set_text(1, "Subchild1")
	message.set_text(0, "Subchild1")
	message.set_autowrap_mode(2,3);
	message.set_text(2, "Lorem ipsum dolor sit amet,\n consectetur adipiscing elit. Sed et tortor id urna vehicula tristique nec non justo. Praesent id iaculis augue. Cras non sapien eget mi posuere efficitur. Pellentesque ac tortor at dui eleifend fermentum. Ut imperdiet pulvinar lacus ut maximus. Nunc pellentesque urna sit amet lectus eleifend, ac maximus magna lacinia. Curabitur accumsan nunc a diam luctus fermentum. Praesent vel nisi dapibus, tristique nulla et, tempor augue.")