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I create a custom JPanel and add it to a JFrame, then I modify the painting code in the panel's paintComponent() method and save the file, but the from designer doesn't update the UI of my panel, I have to reload the designing form manually to make it up to date. It's not convenient for form design. In contrast, eclipse's plugin, the WindowBuilder, are able to do this work well.
A quick way to reload the form is to press Ctrl-R (when the GUI designer is active). *** This bug has been marked as a duplicate of bug 240280 ***