Extension of 'Search' result page in Self Service Procurement Page

Hi All,

We have a requirement to customize functionality related to 'Create Noncatalog Request' button in Self Service Procurement page. We are able to do so in the page as there is a provision to remove the corresponding button from the page.In the place of removed button,we have created the new button from where custom page will be called. But, when we are searching for an item in the 'Search' region and if item is not available, it is directing to a page where seeded 'Create Noncatalog Request' button appears. We could not see any extension/customization facility VB studo related this page/button.