Script For Default Value Of TextBox/ComboBox

Hi, 

     Please help me out Providing VB  Script for Fetching the Default value on any TextBox/ComboBox.

         I have  attched one sample application part , please verify and provide me the VB scripting code for getting the value of

 "FROM STATION", "TO STATION  " -    VALUE  FROM TEXTBOX

 "SELECT"  -   VALUE FROM  COMBOBOX