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 | virtual | 
Draws ribbon slider zoom buttons.
Called by the framework to draw "zoom" buttons located at the right and left sides of slider control. The buttons are displayed as a circle with "+" or "-" signs inside.
Override this method in a derived class to customize appearance of "zoom" buttons.
| pDC | A pointer to a device context. | 
| pSlider | A pointer to slider whose button is about to be drawn. | 
| rect | Specifies bounding rectangle of "zoom" button. | 
| bIsZoomOut | If TRUE, the button is the right button with sign "+" (zoom out), otherwise the button is left, with sign "-" (zoom in). | 
| bIsHighlighted | If TRUE, the button has highlighted state. | 
| bIsPressed | If TRUE, the button has pressed state. | 
| bIsDisabled | If TRUE, the button is disabled. |