Raising widget above non-parent Toplevel?

Thanks for reading this.

I have an application implemented as two separate windows: a MainWindow and a 
Toplevel.

The MainWindow occasionally spawns a warning (a homebrew dialog box) which 
needs to be unconditionally visible, has to have the focus, grab the keyboard 
etc....so I do things like this:

$warning->transient($warning->Parent->toplevel);
$warning->grab;
$warning->raise;
$warning->focus;
$warning->waitWindow;

All of this works fine...provided the parent MainWindow has the focus.

If, however, the Toplevel has the focus, then the $warning pops up underneath 
the Toplevel and is not (or only partially) visible.

My question: is there a way to force the warning widget above the non-parent 
Toplevel? If so, how?

Wilbert.

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