JQueryUI Autocomplete collides with legacy code

My issue is. I have jQueryUI in version 1.8.5 and lot and a lot of legacy source code in a project. In legacy code it happens that there is 3ple times registred plugin autocomplete for jquery. However jQueryUI is registring the very same plugin. So when I type into my javas开发者_如何学JAVAcript:

$('#some_id').autocomplete();

It's not actually a jQueryUI.

Any chance to explicit choose UI?

I tried such approach:

jQuery.fn.myautocomplete = jQuery.ui.autocomplete

And then to use in my code:

$('#some_id').myautocomplete();

But this does not work. (Well it was a blind shoot so I did not expect to much.)

Any suggestion how to workaround the problem.

P.S. Legacy code is blessed by the Pope and cannot be removed for next year or so.

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You can:

1. download jquery.ui without autocomplete
2. change jquery.ui source
3. change old plugin source