JTabbedPane with FormLayout problems

I created form which contain JTabbedPane within JPanel with FormLayout. In the JTabbedPane, I put JPanel with FormLayout. In Design Mode, there is nothing problem, I can put whatever item into the JPanel of JTabbedPane. But in Runtime Mode, JTabbedPane display nothing, many items I've put on it are not displayed. But when I change the Layout into another like XY Layout or FlowLayout, items are displayed correctly.
any idea to solve this?
and why JDeveloper doesn't implement SpringLayout?

Hi user567546, i faced the same problem.
Fortunately, I solved it by using PanelBuilder instead of Panel,
take a look at this example:
http://www.java2s.com/Code/Java/Swing-Components/DemonstratesthebasicFormLayoutsizesconstantminimumpreferred.htm
Regards,
Luis R.

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