Lets go over the steps to plot Chart and Grid once
again:
Once you copy the new code*  at the end of the message 
You need to perform the following: 
Set Blank bars in right margin  to 10 .
Preferences
Window 
Right click on chart select Parameters and press  "YES"  on
"PlotGrid" option.
Parameters
Window 
Note that:
Grid is plotted for the chart area in the right of  Vertical
Selection Line. Chart
and Grid 
* The following code includes the option to choose form 3 ways  of calculating
the box size:
1.      
Traditional  (Box size default
value  = 1  with increments of 10 points)
2.      
Percentage (Box size default value 1% 
of last value close with increments of 0.1%).
3.      
Average True Range (Box size default value last value ATR
(20)  with increments of 10 % of ATR (20) ).
You  can choose to apply this from "Scaling Method"
 drop down 
menu in Parameters 
Don't forget to
check the code in formula editor before you apply
//Copy ----------------------------------------------------
GraphXSpace = 5;
SetChartBkColor(ParamColor("BackGroundColor", 
colorBlack));
GraphColor =  ParamColor("GarphColor",colorLightGrey);
GridColor = ParamColor("GridColor", ColorRGB(39,49,
67) );
Scaling = ParamList("Scaling Method", "Traditional|Percentage|AVG
True Range");
if( scaling == "Traditional")      Box =
Param("Box", 1, 0.2, 10, 0.1); 
else
if( scaling == "Percentage")      Box = Pa!
ram("Box ", 1, 0.2, 10, 0.1)/100 * LastValue(C); 
else
if( scaling == "AVG
 True Range") 
Box = Param("Box", 1, 0.3, 5, 0.1) * LastValue( ATR (20)); 
shiftChart =0;
shiftLastClose =1;
shiftGrid =7;
shiftPriceAxis = 2;
Reverse = Param("Reverse", 3, 1, 5);
j = 0;
PFL[0] = Box * ceil(Low[0]/Box) + Box;
PFH[0] = Box * floor(High[0]/Box);
direction = 0;
for( i = 1; i < BarCount; i++ )
{
if(direction[j] == 0)
{
if(Low[i] <= PFL[j] - Box)
{
PFL[j] = Box * ceil(Low[i]/Box);
}
else
{
if(High[i] >= PFL[j] + Reverse*Box)
{
j++;
direction[j] = 1;
PFH[j] = Box * floor(High[i]/Box);
PFL[j] = PFL[j - 1] + Box;
}
}
}
else
{
if(High[i] >= PFH[j] + Box)
{
PFH[j] = Box * floor(High[i]/Box);
}
else
{
if( Low[i] <= PFH[j] - Reverse * Box )
{
j++;
direction[j] = 0;
PFH[j] = PFH[j - 1] - Box;
PFL[j] = Box * ceil(Low[i]/Box);
}
}
}
}
delta = BarCount - j -1;
direction = Ref(direction, - delta);
Hi = Ref(PFH, -delta) + Box/2;
Lo = Ref(PFL, -delta)- Box/2;
Cl = IIf(direction == 1, Hi, Lo);
Op = IIf(direction == 1, Cl - Box, Cl + Box);
PlotOHLC(Op, Hi, Lo, Cl,"", GraphColor , stylePointAndFigure|styleNoLabel,
0, 0 ,shiftChart);
Last = Ref( LastValue(C), -(BarCount-1));
Plot( Last,"", colorRed,styleNoLine|styleDots, 0 , 0,
shiftLastClose);
// selected value
Value= IIf(direction>0, SelectedValue(Hi)-box/2, SelectedValue(Lo)+box/2);
//-----------------------------------------------------------------------
//        GRID CONSTRUCTION
//----------------------------------------------------------------------
PlotGridLines = ParamToggle("PlotdGrid", "Yes!
|No", 0) ;
if (PlotGridLines)
{
begin = SelectedValue(BarIndex());
end = LastValue(BarIndex());
period = end-begin +1;
if( begin<end)
{
ScreenHigh =LastValue( HHV(cl, period ));
ScreenLow =LastValue( LLV( Cl, period) );
top= LineArray( begin-shiftGrid, screenHigh, end, screenhigh, 0 , 1);
Bot= LineArray( begin-shiftGrid, screenlow, end, screenLow, 0, 1);
Plot( top, "", gridColor,styleLine|styleNoLabel , 0, 0,shiftGrid);
//Plot( bot, "", gridColor,styleLine|styleNoLabel,  0 , 0 ,
shiftGrid);
VerticalGrid = IIf ( BarIndex() >= begin, IIf(direction==1, screenHigh,
screenLow), Null);
Plot (VerticalGrid, "", gridColor, styleStaircase|styleNoLabel,
0,0, 1);
    format = 8.2;
    for  ( n=LastValue(bot); n< LastValue(top) -
0.5*box; n = n+box)
    {
        
    Plot(  bot , "", gridColor,
styleLine|styleNoLabel, 0, 0 ,shiftGrid);
    
    
    text = NumToStr(LastValue(bot) + 0.5*box, format);
    xposition = BarCount+shiftPriceaxis;
    yPosition = LastValue(bot)+0.27*box;
    
    PlotText(text,  xPosition , yPosition, colorWhite);
    bot = bot + box;    
    }    
}
}
//---------------------------------------------------------------------
//    TITLE 
//----------------------------------------------------------------------
Title = "\n" + 
" Instrument : " + Name() +  FullName()+"\n " +
"Formula : " + " PF StockChart" + "\n " +
"Box  : " +  ! box + "& nbsp;   
" +
"Reverse : " +  reverse + "\n " +
"ATR : " + LastValue(ATR(20));