BCGControlBar Pro for MFC
UINT BCGM_RIBBONEDIT_ON_FILL_AUTOCOMPLETE_LIST

This message is sent to parent frame when a Ribbon edit with auto-complete mode was changed.

Parameters
wParama pointer to CBCGPRibbonEdit object.
lParama pointer to CStringList (result).
Returns
The return value is ignored.

You should process this message to fill the Ribbon edit auto-complete list.