Customizing standard UWL Filter

Hi All,

We have a requirement in which we need to modify the functionality of standard Filter button in UWL.

Say A is entered in text box for search, it currently filters all the tasks which contain/starts with A.

If I enter A and B, it filters all tasks containing A and B both(A and B).

But what I want is, to get all tasks which contain either A or B(A or B).

1. Is it possible to achieve this by xml modification? tried with this option without much success.

2. Can it modified by changes in PAR file?

If so, can anyone please give information where and what changes to be done in PAR file.

Regards,

Sumangala