struct MyOption : Option {
	virtual void LeftDown(Point p, dword keyflags) {
		SetFocus();
		Option::LeftDown(p, keyflags);
	}
};

.......
TreeCtrl tree;
Array<MyOption> option; // clear before loading tree...
.......

TreeCtrl::Node node(option.Add());
option.Top().SetLabel(text);
int id = tree.Add(parentid, node);