A message widget is similar to a label widget but for multi-line text. As its name suggests it is mostly used for creating popup message information boxes.
An example of a message widget is
message .msg -text "Your data is incorrect.\n\n \ Please correct it and try again." \ -justify center
which will create a message widget displaying the text shown, center justified. The width of the message box can be given through the -width switch. Any lines that exceed the width of the box are wrapped at word boundaries.