This example shows the message widget.

The message widget displays a line of text (like the label widget), wrapping the text so that it respects a specified ratio of width and height.

- The aspect parameter express (in percent) the ratio of height/width.
- The text or init parameter set the initial displayed text (if both specified, init prevails).
- The handle parameter allows to change the displayed text
- The return parameter will bind the specified variable to the displayed text when the window is closed.
