[plt-scheme] closing browser window without ending the program

I have a GUI programmed with MrEd that, when you click on one of the buttons in the GUI, it launches a plain-vanilla browser window hyperlinked a url, using the browser.ss package and the (open-url url) function as the callback for the button. That works fine and dandy on launch, but when you close the browser window and go back to the GUI, it closes the GUI as well and ends the program. How can I make the close button just close the browser window and not terminate the program?

Thanks in advance,
Leslie :)




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