You can pass constants of type ThemeTabDirection to the function DrawThemeTab to draw theme-compliant tabs that are oriented in various directions. You can also pass a ThemeTabDirection constant to the function GetThemeTabRegion to obtain the region containing a tab oriented in a particular direction. The ThemeTabDirection constants are available with Appearance Manager 1.1 and later.
enum {
kThemeTabNorth = 0,
kThemeTabSouth = 1,
kThemeTabEast = 2,
kThemeTabWest = 3
};
typedef UInt16 ThemeTabDirection;