Can't exclude some pair from AutoCloseCmd per filetype

[petRUShka]

I want to turn off autoclose for "`" only for .tex files. I tryed to use:

au FileType tex let g:AutoClosePairs_del = "`"

This line add "`" to g:AutoClosePairs_del but don't affect on AutoClosePairs behaviour.

At the same time as the line

let g:AutoClosePairs_del = "`"

Works as expected.

Is it possible to turn AutoClosePairs off on some pairs on some filetypes?