Focus on an Item (based on button click) in OAF page

Hi,
I am new to OAF. I face an issue in a OAF page. The page has got 'message input text fields', 'Apply' and 'cancel' button. Once the page is rendered , there is no initial focus on any item. If i click on the page or use tab to navigate to a text field , the focus moves to the 'Apply' button (by default). The real problem is, even before entering the details , if i accidentally press the *'ENTER'* key , the apply action is triggered(where the focus relies).
1. I just need to find out why the focus moves to the particular button item , when i click on text box or anywhere in the region.
2. Is there any mouse event mapped to the page or that item ?
3. I don't want that focus to be on any button (when i click in the page region or place the cursor in text box to enter values).
How to achieve this?
Is this can be done using personalization or its has to be looked up in the CO of that page.
Please help me on this.
Thanks and Regards,
Raghav

Hi Gaurav,
Thank you so much for your quick response.That page has got a custom CO which got extended from another main CO . I need to add this code in the processRequest() of the main CO for that particular PG or in this custom CO. Correct me if i am wrong.
Thanks and Regards,
Raghav

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Mark as Answer if helped!! To be or Not to Be..The question is this only......

Focus on an Item (based on button click) in OAF page

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