problem with hod on in subplots with same axes

Hi, I have two subplots with different series. After creating the two subplots I change the axis position such that they have the same x-Axes. After I need to add some other variable to these subplots keeping the old series. I have set hold on for all the series and this works well if I don't unify the x-axis. The code I used is below:

if true

   subplot(2,1,1);
barChartPlot2(Prices(1:end,2),Prices(1:end,3),Prices(1:end,4),Prices(1:end,5));
set(gca,'XLim',[0 rows(H)]);
hold on
hold all
h2=plot(t',min1(1:end),'r','LineWidth',2);
hold on
hold all
h3=plot(t',max1(1:end),'b','LineWidth',2);
hold on
hold all
t=1:rows(ATRD);
subplot(2,1,2);
h4=plot(t',ATRD(1:end),'k','LineWidth',2);
hold on
hold all
h4b=plot(t',ATRDM(1:end),'r','LineWidth',2);
hold on
hold all
h5=plot(t',zeros(1:rows(H),1),'k','LineWidth',2);
hold on
hold all
%%%Same axis
ax=get(gcf,'children');
pos=cell2mat(get(ax,'pos'));
for ii=length(ax):-1:1
    if (~strcmpi(get(ax(ii),'type'),'axes'))|(strcmpi(get(ax(ii),'tag'),'legend'))
        ax(ii)=[];
    end
end
ytop=pos(:,2)+pos(:,4);
[ytop,idx]=sortrows(-ytop);
ax=ax(idx);
pos=pos(idx,:);
HH=(pos(1,2)+pos(1,4))-pos(end,2); %total height of axes
    Hused=sum(pos(:,4));
    stretch=max(HH/Hused,1);

    pos(1,2)=pos(1,2)-pos(1,4)*(stretch-1);
    pos(1,4)=pos(1,4)*stretch;
    pos(2,4)=pos(2,4)*stretch;

    set(ax(1),'pos',pos(1,:));%OKOK
    for ii=2:length(ax)
        pos(ii,2)=pos(ii-1,2)-pos(ii,4);
        set(ax(ii),'pos',pos(ii,:));

    end

 set(ax,'Yaxislocation','left');    
 set(ax(end),'xaxislocation','bottom');
xlims=get(ax,'xlim');
xlim=[min([xlims{:}]) max([xlims{:}])];
set(ax,'xlim',xlim);
set(ax(1,:),'Xtick',1:21:rows(H))
set(ax(2,:),'Xtick',1:21:rows(H),'XTickLabel',datestr(Data(1:7:end),'dd-mm HH:MM'));
linkaxes(ax,'x');
  end

Basically if I run the code until the line you see OKOK, if later I recall subplot(2,1,1) to write the other series the old ones are kept. While if I run to the next line and than I recall subplot(2,1,1)all the series are erased and the subplot turns white.

I have no Idea about it.

I hope someone can help me.

Gaia