main menu bar caption won't change?

I can't seem to change the captions of the menu bar
itself in an MDI app.  It seems this code should work...

  File1.Caption := 'File NOT!;

...but I have to play with the program for while before
it finally redraws the caption I want.

When no child windows are up, it does work.  The child
windows do merge their menus with the main menu.

Specifics:
  Delphi 1.0
  MDI app
  main menu bar captions won't change for child windows
   (Items in the menu bar change just fine!)

Thanks!

Mike Leahy