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If variables and commands editors would not be modal, that will greatly improve the process of profiles development. (See also http://www.netbeans.org/servlets/ReadMsg?msgId=554013&listName=nbdev).
Technically this could be done by returning a Window/Dialog instead of Component for the property editor (assuming this uses property editors). As former owner of the property sheet, I strongly discourage doing this. Perhaps some custom UI for profile development would be a better choice. Maybe include some UI for testing the result on a real filesystem, or at least test running commands and showing what the command-line text would be.