TMenuItem.OnAdvancedDrawItem for "Window" SubItems

I wrote an MDI application that has a generic handler for the
OnAdvancedDrawItem event for each one of the TMEnuItems within a
TMainMenu. This handler is assigned dynamically in the OnCreate MainForm
(Iterating Items).
The problem is that MainForm has a Menu property, and this create an
item for each MDIChild Form.

How do I assign OnAdvancedDrawItem event of such items created
dynamically?   In Oncreate not yet exist!

Sorry for my english