Index: GUIVerticalScrollbar.cs
===================================================================
--- GUIVerticalScrollbar.cs	(revision 27877)
+++ GUIVerticalScrollbar.cs	(working copy)
@@ -119,9 +119,8 @@
       float fPosYOff = (fPercent / 100.0f);
 
       // Scale handle-parts for resolution.
-
       int backgroundWidth = _imageBackground.TextureWidth;
-      GUIGraphicsContext.ScaleVertical(ref backgroundWidth);
+      GUIGraphicsContext.ScaleHorizontal(ref backgroundWidth);
       _imageBackground.Width = backgroundWidth;
 
       int handleHeight = _imageTop.TextureHeight;
@@ -130,14 +129,14 @@
       _imageBottom.Height = handleHeight;
 
       int handleWidth = _imageTop.TextureWidth;
-      GUIGraphicsContext.ScaleVertical(ref handleWidth);
+      GUIGraphicsContext.ScaleHorizontal(ref handleWidth);
       _imageTop.Width = handleWidth;
       _imageBottom.Width = handleWidth;
 
       _heightKnob = (int)(2 * _imageTop.Height);
       _startPositionY = _imageBackground.YPosition;
-      _endPositionY = _startPositionY + _imageBackground.Height - _imageTop.Height;
-      fPosYOff *= (float)(_endPositionY - _startPositionY);
+      _endPositionY = _startPositionY + _imageBackground.Height;
+      fPosYOff *= (float)(_endPositionY - _imageTop.Height - _startPositionY);
       _knobPositionY = _startPositionY + (int)fPosYOff;
 
       _imageBackground.Render(timePassed);