I stumbled over a funny layout problem in an info panel. (See attachement.) The easiest way to reproduce the problem is to go to the SDK example apps and double click "SwingJavaFXChart_browser.jnlp". This results in an error popup window. In this window click on the "Details" button. This opens another window with the details. Now drag the lower right corner of this window in order to increase the size of this window and you will see that this window is suddenly getting holes through which you can see your desktop background. This is due to the fact, that the window is resized (which should indeed be possible) but the content is not.