gtkExpanderNewWithMnemonic: gtkExpanderNewWithMnemonic
Description
Creates a new expander using 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.Usage
gtkExpanderNewWithMnemonic(label = NULL)
Arguments
label
the text of the label with an underscore in front of the
mnemonic character. [  allow-none  ]