Implemented:

- showing the selected tab as highlighted
- support for drawing the focus rectangle
- basic keyboard support
- support for a tab with horizontal scrolling.

include/tab.h

@@ -15,23 +15,29 @@ typedef struct tagTAB_ITEM
   INT    cchTextMax;
   INT    iImage;
   LPARAM lParam;
-    RECT   	rect;		/* bounding rectangle of the item */
+  RECT   rect;    /* bounding rectangle of the item relative to the
+		   * leftmost item (the leftmost item, 0, would have a 
+		   * "left" member of 0 in this rectangle) */
 } TAB_ITEM;
 
 typedef struct tagTAB_INFO
 {
   UINT       uNumItem;        /* number of tab items */
-    INT	    nHeight;	/* height of the tab row */
+  INT        tabHeight;       /* height of the tab row */
   HFONT      hFont;           /* handle to the current font */
   HCURSOR    hcurArrow;       /* handle to the current cursor */
   HIMAGELIST himl;            /* handle to a image list (may be 0) */
   HWND       hwndToolTip;     /* handle to tab's tooltip */
   UINT       cchTextMax;
+  INT        leftmostVisible; /* Used for scrolling, this member contains
+			       * the index of the first visible item */
   INT        iSelected;       /* the currently selected item */
   INT        uFocus;          /* item which has the focus */
   TAB_ITEM*  items;           /* pointer to an array of TAB_ITEM's */
-    RECT	    rect;
   BOOL       DoRedraw;        /* flag for redrawing when tab contents is changed*/
+  BOOL       needsScrolling;  /* TRUE if the size of the tabs is greater than 
+			       * the size of the control */
+  HWND       hwndUpDown;      /* Updown control used for scrolling */
 } TAB_INFO;