Removed the timer that was used to queue TRACKBAR_Refresh calls.
Removed all direct calls to TRACKBAR_Refresh (except from within the
WM_PAINT handling section) and replaced them by calls to
InvalidateRect.
Fixed a bug in the TRACKBAR_SetPos function.
Fixed the behavior for different types of mouse input.

include/trackbar.h

diff --git a/include/trackbar.h b/include/trackbar.h
index 39884b2..9e15707 100644
--- a/include/trackbar.h
+++ b/include/trackbar.h
@@ -18,26 +18,25 @@
     INT  nPos;
     UINT uThumbLen;
     UINT uNumTics;
-	UINT  uTicFreq;
-	HWND hwndNotify;
+    UINT  uTicFreq;
+    HWND hwndNotify;
     HWND hwndToolTip;
     HWND hwndBuddyLA;
     HWND hwndBuddyRB;
     INT  fLocation;
-	COLORREF clrBk;
-	
-	INT  flags;
+    COLORREF clrBk;
+    INT  flags;
     BOOL bFocus;
     RECT rcChannel;
     RECT rcSelection;
     RECT rcThumb;
-	INT  dragPos;
+    INT  dragPos;
     LPLONG tics;
 } TRACKBAR_INFO;
 
 
-#define TB_REFRESH_TIMER       1
-#define TB_REFRESH_DELAY       1
+/* #define TB_REFRESH_TIMER       1 */
+/* #define TB_REFRESH_DELAY       1 */