How do I get the control ID of a omnibox so I can use it in coding

I have a little bit of code that opens my browser (chrome), I want to enter a string into the
URL omnibox using ControlSend. Each time I launch the browser the control ID changes.
I need to find a way to fist get the control ID of the browser after it is opened and have the
id number be a value in a variable. Can some one tell me how to get the ID using autoit
code?