Called by the framework to display a separator.
The default implementation displays the standard separator. Override this member function in your CBCGPVisualManager - derived class to customize the separator appearance. Do not call the default. 
- Parameters
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    | pDC | A pointer to a control bar's device context. |  | pBar | A pointer to a control bar whose separator is drawn. |  | rect | Specifies the bounding rectangle of a separator. |  | bIsHoriz | Specifies whether the control bar is docked horizontally (TRUE) or vertically (FALSE). |