macvim

Hi:
I am new to Vim.
I have new version of MacVim a OS X: 10.7.4

I installed the latest MACVIM app.

I was reading about balloons in a book, i want to create some tooltips
for f# language.

The problem is that i tried to activate the balloons and is not
working.
I tried directly from vim:
:set ballooneval
:set balloondelay=400
:set ballonexpr="textstring"

or in the .gvimrc, but isn't working :(

1 "set nu
2 colorscheme slate
3 function! SimpleBalloon()
4 return 'Cursor is at line/column: ' . v:beval_lnum .
5 \'/' . v:beval_col .
6 \ ' in file ' . bufname(v:beval_bufnr) .
7 \ '. Word under cursor is: "' . v:beval_text . '"'
8 endfunction
9 set balloonexpr=SimpleBalloon()
10 set ballooneval

Have any idea?
I don't think this is an issue, but i can't find anywhere the solution
to this.
Please, could some one help me with this problem?

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