SelectionMode 
    Used to control what selections users are allowed to make.
Entries
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                  Exactly one element is selected. In some circumstances, such as initially or during a search operation, it’s possible for no element to be selected with %GTK_SELECTION_BROWSE. What is really enforced is that the user can’t deselect a currently selected element except by selecting another element.
Functions
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                  Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
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                  Returns an array containing the constants of this enum type, in the order they're declared.