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label as the text of the label.
If characters in label are preceded by an underscore, they are underlined.
If you need a literal underscore character in a label, use '__' (two
underscores). The first underlined character represents a keyboard
accelerator called a mnemonic.
Pressing Alt and that key activates the button.gtkExpanderNewWithMnemonic(label = NULL)labelGtkWidget] a new GtkExpander widget.