A widget that displays a check-box.
This is a very common widget, used to display a check-box; optionally
with a label beside it. It is generally used to get some input from the
user (just like a button). This is actually a
GtkToggleButton placed next to a widget (usually
next to a GtkLabel) but displays a check mark to
indicate that it is in a toggled state.
A group of check buttons are usually used when you require the user to
select none or more of the given options. Note that this widget behaves
exactly like a GtkToggleButton.
Creates a new check-box toggle button.
([string label = null
[, bool use_underline = false