System scrollbar components are designed to 'disappear' when the view is stationary on a device with multitouch capabilities (i.e. a Laptop). The bars should appear when scrolling is occurring, or should be displayed all the time only when a non-multitouch mouse is plugged in.
In addition to this, scroll views include 'bounce' scrolling behaviour, to give a more fluid feeling to applications.
This behaviour is expected of all applications using what appear to be system components, and not providing this behaviour clashes with other applications in a way that is unpleasant for users. The application feels as if it has been ported to OSX using a UI toolkit that doesn't support system functionality.
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