!!URGENT!! Create Search Help on SAP Web Dynpro using BAPI

I am trying to create a Search Help on SAP Web Dynpro screen for a field by calling a elementary search help within SAP using BAPI.I have created a BOR object and assigned the BAPI "BAPI_HELPVALUES_GET".

What is the best way of creating the BAPI ? What is the structure for BAPI? Is there any other BAPI which can be used?

Please advise

Thanks and Rgds

Shankar