getting point position in pixels and then to start a plot from this point but using another axis

Hi all,

I have GUI application with two x-axes (top and bottom) and one y-axes.

So I need to draw a point using top x-axes, and then get position in pixels of this point to draw a plot on bottom x-axes using this point as a start point.

I write for point.

x1 = 6;
y1 = 4.2;

xlimit=[2 8]
ylimit=[2 6]
axesPosition = [100 108 430 209]; 

h1 = axes('Units','pixels','Position',axesPosition,...
          'Color','none','XColor','r','YColor','r',...
          'yticklabel',[],'ytick',[],'xlim',xlimit,'ylim',ylimit,...
           'NextPlot','add');
 set(h1,'xaxislocation','top','yaxislocation','right')

h1=plot(x1,y1,'r')

What should I write for a line starting from this point, but with 'xaxislocation','bottom' and the same 'yaxislocation'?

Thank you!

[Walter Roberson]

You might want to start with plotxx

http://www.mathworks.com/matlabcentral/fileexchange/317-plotxx-m