When setting sizable="true" on a Panel in a Portal Layout, there are a couple of bugs I have discovered. First, it allows horizontal resizing, which doesn't make sense in the Portal Layout. Second, when you move a Panel within the Portal Layout, it loses its ability to be resized, although isSizable() still returns true. The mouse cursor simply does not change to the resizing symbol when hovering over the border any more. Furthermore, if you have resized the Panel before moving it, it returns to its original size after being moved.