Populating DropdownByKey by accessing backend

Hi All,

As i am new to this Webdynpro and SAP,I want to know how should I populate the value in Dropdown list box by Accesing Bapi Functions.I want to show all of my available networks (BAPI_NETWORK_GETLIST) in Dropdown list.Is there any document for that,Could anyone plz suggest me some pdfs.

Thankx in Advance.

Shakthi