You can however, use a Dialog (which messageBox is based on)
This is only true for X11 systems, but AFAIK on Windows the messageBox is a native Windows dialog.

In Tk804.027_501 there's a new Tk::MsgBox, which looks slightly less ugly and where your ->Icon trick also works.

In reply to Re^2: Missing TK Messagebox icons by eserte
in thread Missing TK Messagebox icons by schimkat

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