How to get bean value in Advanced Search OA Framework

In Advanced search the criteria is stored in order of Value_0,Value_1,...

I want to set a oaMessageChoice bean value in page load(processRequest)

My code will be.

OAAdvancedSearchBean advBean = (OAAdvancedSearchBean)webBean.findChildRecursive("advancedSearch");
OAMessageChoiceBean StatusSearch = (OAMessageChoiceBean)advBean.findChildRecursive("Value_1");
StatusSearch.setValue(pageContext,"Pending with Alliance");

where

advanced search is the ID of AdvancedSearch Region