...
const int SignalLength = 1024;
int ZoomFactor = 2;    //Updated by user
int NewPoints = SignalLength * ZoomFactor;
...

private void ZoomFactor_Changed(object sender, EventArgs e)
{
    if (ZoomFactor > 1)
    {
        Scrubber.Width = (ScrubberTrackPanel.Width / ZoomFactor);
        ScrubberWidth.Text = Scrubber.Width.ToString();
        ScrubberTrackPanel.Visible = true;
    }
    else
    {
        ScrubberTrackPanel.Visible = false;
        Scrubber.Width = Scrubber.Parent.Width;
    }
}
private void SfBtn_GridScrollRight_MouseDown(object sender, MouseEventArgs e)
{
   // Both left and right button's tag property have the step value.
   // Left has -2 
   // Right has 2
   GlobalVars.GridScrubStepSize = 0 + int.Parse((SfButton)sender).Tag.ToString());
   GridScrubberTimer.Start();
}
private void GridScrubberTimer_Tick(object sender, EventArgs e)
{
    ScrollGrid(GlobalVars.GridScrubStepSize);
}
private void ScrollGrid(int StepSize)
{
   var newStepPos = GlobalVars.ZoomedSignalLeft + StepSize;
   //To stop scroll timer if any of the boundry (left/right) of graph is reached.
   if (newStepPos <= 0 || newStepPos >= 1024 * ZoomFactor && GridScrubberTimer.Enabled)
   {
       GridScrubberTimer.Stop();
       return;
   }
   var ZoomedSignalSlice = GlobalVars.ZoomedSignal.Skip(newStepPos).Take(1024).ToList();
   if (ZoomedSignalSlice.Count == 1024)
   {
       GlobalVars.ZoomedSignalLeft += GlobalVars.GridScrubStepSize;
       if (ScrubberTrackPanel.Visible)
       {
           Scrubber.Location = new Point(Scrubber.Location.X + (int)Math.Floor(GlobalVars.GridScrubStepSize/ (float)ZoomFactor), 0);
           ScrubberCords.Text = Scrubber.Location.ToString();
       }
       GraphGrid.Refresh();
   }
}

...
GlobalVars.ZoomedSignalLeft += GlobalVars.GridScrollStepSize;
// Mapping the current beginning position of the visible signal on the grid in the range of ScrollerTrackPanel and then dividing 
// it with the ZoomFactor To get location of scrubber over the signal image proportional to the visible signal on the grid.
int newx = (int)Math.Floor(GlobalVars.ZoomedSignalLeft / 1024F * ScrollerTrackPanel.Width / ZoomFactor);
Scrubber.Location = new Point(newx, 0);
...