superimpose two or more plots

Hi, i am able to impose two plots at the moment using the code bellow however when I remove the axis for the second plot the second plot line matches the axes of the first plot. Is there a way to keep the second h=plot(hover,x,y) the way it is onto the first plot after removing the axes?

i've tried hold on, axis([Pmin Pmax -inf inf]) but nothing worked. any ideas? thank you

 plot(handles.Axes1,SomeX,SomeY)
 h_ax(1) = axes('parent',hObject,...
                'position',[xpos+.009, cpos(2), cpos(3) *.00066, cpos(4)],...
                'Tag','Top', 'NextPlot', 'add');
 hplt = plot(h_ax,x,y);
 hover = axes('parent',hObject,...
              'position',[cpos(1), cpos(2) cpos(3) cpos(4)],'Layer','top',...
              'box','off','selected','off','visible','off','Xgrid','off',...
              'Ygrid','off');
 h=plot(hover,x,y);
 set(h,'Color',ycolor);
 axis(hover,'off','tight')