DataTips always appear in ViewStack container

Question

I have a Panel container set to a specific width and height.
Inside this is a ViewStack with percentHeight and
percentWidth set to 100.
Each ViewStack child is a VBox with a specific height and
width set so that it fits in the Panel without scrollbars
appearing.
Each VBox contains a List control with percentHeight and
percentWidth set to 100 and with showDataTips set to true.
The problem is that the data tips pop up on every item of
every list regardless of whether they extend beyond the width of
the VBox or not.
If I remove the ViewStack from the chain of children, the
problem disappears.
It looks to me as though the ViewStack has an unusual way of
sizing itself compared with other containers and that this could be
the cause of the problem.
Does anyone have any ideas how this problem can be resolved.
Doug

Answer 1

As you have set a null layout on the content pane, the BorderLayout.CENTER in this code linecontentPane.add(scrollingArea, BorderLayout.CENTER);is ignored.
As you have not set the bounds (or size and location) of scrollingArea, it is not seen. A null layout will not respect the preferredSize you have set for scrollingArea.
It's far better that you learn to use Layout managers. There's a good tutorial here:
The Java™ Tutorials: [Laying Out Components Within a Container|http://java.sun.com/docs/books/tutorial/uiswing/layout/index.html]
luck, db