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 | virtual | 
Called by the framework to draw a radio button.
Override this method in a derived class to customize appearance of radio buttons.
| pDC | A pointer to a device context. | 
| rect | Bounding rectangle. | 
| bOn | Radio button state. If TRUE, the radio button is checked. | 
| bHighlighted | If TRUE, the radio button is highlighted. | 
| bPressed | If TRUE, the radio button is pressed. | 
| bEnabled | If TRUE, the radio button is enabled. |