I played around with the Matchbox settings for a bit, and I'm pretty sure that there are no options for this. After that, I read
the documentation (!!) and it seems to confirm it:
Quote:
Matchbox's style of management is restrictive in nature, setting application windows with a maximized static geometry in a browsable stack or deck with only one application being visible at any time.
Different, though applicable, rules apply to other window types such as dialogs, panels and input method windows.
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So it seems that matchbox is designed from the ground up to only show one window at a time. You can get around this by calling your window a 'dialog', as others have said. I don't know how much this helps, though.