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 | virtual | 
Called by the framework when it needs to draw light box dialog (CBCGPLightBoxDialog) "Close" button.
| pDC | A pointer to a device context. | 
| pDlg | The ligh-box dialog. | 
| rectClose | Specifies the bounding rectangle of a close button. | 
| bIsHighlighted | Specifies whether close button is highlighted. | 
| bIsPressed | Specifies whether close button is pressed. | 
Override this method in a derived class in order to customize the LightBox close button appearance.