In the tutorial you can read:
This block of code can look confusing. Remember those variables I declared in the @db_fields area? Well, here they are put to use, such as $db_name (readable version) and $db_type, which determines the input type.
This is a bit wrong or confusing, because in the code he is using %db_type (i.e. as $db_type{xy}) and not $db_type, but lets hope the code is right.
So there should be a $db_name{$obj} where you would find the name of your drop down box, either 'Type Of Change:' or 'Machines involved :'
UPDATE: In the example code $db_name{$obj} is used too, so there definitely IS a $db_name{$obj}.
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