Which version of cq you are reffering? I have never seen manage tab
This is about the managedtab but I think probably your problem stems from the wrong copy or dirty build. It should work with copy as is if all the dialog is copied as is from the foundation.
Sometimes things are easier said than done. My previous comments is an example of this. ~
When I tried to customize the list, I also observed the error you encountered.
When I looked closed, the problem seems to come from the sequences of the items in the "items" node of dialog.
I resolved it by openening the libs dialog and customized dialog for list component i.e. http://localhost:4502/libs/foundation/components/list/dialog.htmland customized dialog path. All the sequences of the items should be same in both original and customized list dialog. It is not the case so thererfore you need to change it using dialog editor by dragging and dropping. After each drag drop, save the change.
I tried rearranging it.. But still it didnt work for me
Thanks for clarifying.