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button-default_button
button <- default_button: [bool]
Button is default button for its graphical<-device. This implies two things. First of all, if an item in the dialog is modified, the item will invoke dialog->modified_item. If the dialog finds a device<-default_button, it will make the default button graphical->active. If the RETURN key is hit in the dialog window, the default button will be button->execute’d.
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