BCGControlBar Pro for MFC
UINT BCGM_ON_CHART_AFTER_DRAW

The framework sends the BCGM_ON_CHART_AFTER_DRAW registered message to an owner of chart visual object when the drawing has been completed.

Parameters
wParamHIWORD - drawing flags (BCGP_DRAW_STATIC or BCGP_DRAW_DYNAMIC). LOWORD - ID of chart visual object.
lParama pointer to a graphics manager (CBCGPGraphicsManager).
Returns
the return value is ignored.

You can process this message to implement custom drawing. It's recommended to process this message only when you receive BCGP_DRAW_STATIC flag.