VOID LT_LevelWidth( struct LayoutHandle *handle, STRPTR levelFormat, APTR dispFunc, LONG min, LONG max, LONG *maxWidth, LONG *maxLen, LONG fullCheck );
/*--- Added in v14.0 ---------------------------------------------------*/
VOID LT_NewLevelWidth( struct LayoutHandle *handle, STRPTR levelFormat, APTR dispFunc, LONG min, LONG max, LONG *maxWidth, LONG *maxLen, LONG fullCheck );
/*--- Added in v31.0 ---------------------------------------------------*/
VOID LT_Refresh( struct LayoutHandle *handle );
/*--- Added in v34.0 ---------------------------------------------------*/