const UINT BCGM_GANTT_CONTROL_CREATE_CHART

This message is sent to owner of Gantt control when it's about to create a Chart pane.

Parameters

wParam	this parameter is not used.
lParam	this parameter is not used.

Returns

A pointer to a newly created Chart control (derived from CBCGPGanttChart).

You should process this message in the parent window if you wish to create a custom CBCGPGanttChart - derived Chart pane.