Tree node is not clickable/expandable

I have a very simple tree which is displayed correctly, clickable and expandable on a jsp page…

But when I insert the tree within a popup page, the tree is not clickable or expandable…

I’m not sure what’s the different between the jsp page and popup page, and what prevents the tree from being accessed or updated. Could you please give me some hints as to where to look for the problem…

Thanks

Do you use native popups or some kind of jsLib which create a pseudo pop-ups?
If you are use the same code inside normal page or inside popup page - there must be no difference, but many of pseudo-popups libs use copying content by innerHTML, as result, the component in such pseudo-popup can look normal but all javascript functionality in it - broken.