Toolbar and child dialog and Messages ??

Hi,

I have a Maindialog who has a toolbar and 2 childdialog. The Maindialog knows only 1 child, because this child creats the next child dialog.
Now my Problem. When I hit my Undo-Toolbar button then I dont get the Message in my childdialog (the one from the other child). I think that the child doesn't get the Message ID_EDIT_UNDO. Something is really strange: I have a Hot Key Ctrl Z with the same ID and he works !!!! I tried to catch the message in my PreTranslateMessage-method, but it doesn't work. Why ????

Thanx,
Grit