Why do you need a dialog window in fullscreen size, if it is modal anyway ?

Actualy, I need it to be fullscreen. I mentioned a dialog window because I was only able to retrieve the answer this way but I don't want a dialog window :)

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Have you tried FileList (it isn't fullscreen, and doesn't look as nice as
the FileDialogWindow, but maybe it is easier to hack around with.)

FileList modalFolderSelector: FileSystem disk workingDirectory

Well I think it looks better than my shrank version, I will look into it !