BCGCBPRODLLEXPORT UINT BCGM_ON_CHART_MOUSE_TRACK

The framework sends the BCGM_ON_CHART_MOUSE_TRACK message when you enable mouse tracking with CBCGPChartVisualObject::EnableMouseTrackingMode.

Parameters

wParam	ID of chart visual object.
lParam	a pointer to a BCGPChartHitInfo structure.

Returns

TRUE - disable further mouse move processing. In this case scrolling / selection will not occur (if enabled).

You should process this message to implement interactive charts.