A container that can only contain one child, and accepts events.
draws a bevelbox around itself.
GTK.Button("A button")
GTK.Button("A button\nwith multiple lines\nof text")
GTK.Button()->add(GTK.Image(GDK.Image(0)->set(Image.Image(100,40)->test())))
Signals:
clicked
Called when the button is pressed, and then released
enter
Called when the mouse enters the button
leave
Called when the mouse leaves the button
pressed
Called when the button is pressed
released
Called when the button is released