Hi Andrey. Did you ever get an answer to your question? We have a new PADS community dedicated to scripting so I'm moving your question there in case someone can help you.
For Each f In ActiveDocument.Fields
If f.Name = "Drawn" Then
The Browse Object button is often a difficult place to find unknown commands, it's really there for accessing commands you already know, and it isn't a complete list. Try the Automation Help documents, they are organized pretty well for finding properties and methods when you aren't sure exactly what you need.