Tricky little JScrollPane problem

I have a JScrollPane that contains a JPanel with BorderLayout called "mainPanel".
I have a kind of web appearance with a left child panel of vertical JLabels, a north child panel for title, and a center child panel as a work area inserted into "mainPanel". Simple enough!
The problem is in the center panel, when I insert a child JPanel into it with either FlowLayout or VerticalFlowLayout withthe panel extending completely across the center panel from left to right.
This child panel is hidden-to-the-eye panel because of the background being color same as center panel.
I then add controls to the child panel.
The problem is the scrollbars appear for the child panel that extends the full width of the center panel, instead of the controls, which I DONT want. I want the scrollbar to only show for the controls.
How can I get JScrollPane to ignore child JPanels like it does with the top level JPanel "mainPanel".
thanks

There's a post around from a couple of years ago where I tried to get flowlayout to behave in a scrollpane. I got it to work fairly well, but eventually gave up. I think the real answer is to not use flowlayout in a scrollpane, but you can search for that post if you want.

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