anybody got Outlook Express insight?

Hi there folks,

I am trying to insert my own items into OE tree view on the left (folders
etc).

I have managed to subclass it and insert my own items but i dont know what
should i assign
to lParam of these new items. This looks like to be a pointer to some
internal OE data structure
which defines how OE handles the item when its selected.

Anyone got info?

Thanx alot,
Eugene.