Size of left/right component in a JSplitPane after setVisible()

Hi there,
Could you help me here,
I have a JSplitPane containing 2 JPanels, left and right ones. My app. sometimes needs to call setVisible(false) on these when they are not required. Then, if they are needed again, I call setVisible(true) on them, however after this call, the JPanels are of size 0, so you can't actually see them unless you drag the dividor.
How do I get the size of these JPanels to return to what they were before calling setVisible(false)?

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Size of left/right component in a JSplitPane after setVisible()

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