BCGCBPRODLLEXPORT UINT BCGM_ON_CHART_MOUSE_DOWN

The framework sends the BCGM_ON_CHART_MOUSE_DOWN message when the chart visual object receives a mouse button down notification.

Parameters

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

Returns

TRUE - disable further mouse down processing. In this case zoom /pan/selection will not occur (if enabled).

You should process this message to implement interactive charts.