| 
 | virtual | 
Called by the framework when it needs to draw tooltip label.
Override this method in a derived class if you wish to customize appearance of tooltip label.
| pDC | A pointer to a device context. | 
| rect | Bounding rectangle of the label area. | 
| bCalcOnly | If TRUE, there is no need to draw the label. The method has been called to calculate the label size. |