Remap while completion popup is visible

Hi Everyone,

I would like to remap the <Tab> key so that vim will automatically pick the current selected item from the completion popup.  I thought it would have been easy but was wrong;  here is what I added to my .vimrc file:

  inoremap <expr> <Tab> pumvisible() ? "\<C-Y>" : "\<Tab>"

Vim still keeps adding tabs rather than closing the completion popup.  Is it something wrong with that?  Maybe other plugins interfering?  I even found at least two different resources where something like this is done, but none of them worked.

Cheers,

Matteo

[1] http://vim.wikia.com/wiki/Make_Vim_completion_popup_menu_work_just_like_in_an_IDE
[2] https://github.com/Shougo/neocomplete.vim

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