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Closing the pharo smalltalk window

I am using Pharo Smalltalk version 4.0 to create a simple GUI. I want to make sure the "StandardWindow" I created doesn't close when the user clicks the "X" button in the top corner. Hence, I am sending the message "mustNotClose" to my window object, which is an instance variable of the superclass SystemWindow. However, the window still closes when I press the "X" button. Any ideas what I am missing? Any help would be greatly appreciated.

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The method mustNotClose

is only accessorized to check that the instance variable is mustNotClose

set to true:

mustNotClose
    ^ mustNotClose == true


You should use a method makeUnclosable

that actually removes the close button. Then you can add a close button with makeClosable

.

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