BCGCBPRODLLEXPORT UINT BCGM_CALENDAR_ON_SELCHANGED

This message is sent to owner of calendar bar control when selected date has been changed.

Parameters

wParam	this parameter is not used.
lParam	a handle to calendar bar control.

Returns

the return value is ignored.

You should process this message to receive notifications from CBCGPCalendarBar objects when selection (selected date) has been changed.