delphi - How do i detect new columns added to a list-view control? -

i writing component descends tlistview, , want know when developer using component adds column can react. how can detect when new column added? there event?

there no such event, since component writer, events off-limits anyway. events developers using component.

columns added sending control lvm_insertcolumn messages. override message handler in descendant control:

procedure lvminsertcolumn(var msg: tmessage); message lvm_insertcolumn; 

implement call inherited handler, , whatever want.

procedure tlistviewdescendant.lvminsertcolumn(var msg: tmessage); begin   inherited;   // todo: custom handling end;