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To explicity set the size of the editing window of a JPanel in the form editor, you need to double click on the purple border surrounding the panel area. This brings up the Set Form Designed Size dialog box, where you can enter new dimensions for the form. At the moment, you need to explicitly type in integers seperated by ", ". If the comma or space is missing, you request to change size fails. It would be nice if this was more forgiving, and simply looked for any separating character between the two numbers.
Reassigning to form, please evaluate.