This pane has a scrollbar. Note how the scrollbar disappears and content 'overflows' into the South pane when you you mouse-over the Pop-Up.
So the allowOverflow method is best used only for panes that do not scroll, like a toolbar or menubar.
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The Pop-Up and Drop-Down lists demonstrate the allowOverflow() utility
The allowOverflow() method is attached differently in each pane: North, West & East
NOTE: The allowOverflow method is intended as a last resort - used only when there is no other way to make a popup work.
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