From plotyy towards plotxx

Dear reader,

I find plotyy(x,y1,x,y2) very useful mainly due to its ability to simultaneously execute pan/zoom on the 2 represented curves. Specifically, for my needs the x-axis is common while y1 and y2-axis are different. Here is an example:

figure; 
x = linspace(0,2*pi,1e3); 
y1 = sin(x);
y2 = 2*sin(x);
[AX,H1,H2] = plotyy(x,y1,x,y2); grid on;
set( get(AX(1),'XLabel'),'String','x-axis' );
set( get(AX(1),'YLabel'),'String','y1-axis' );
set( get(AX(2),'YLabel'),'String','y2-axis' );

Notice the x,y1,y2 coordinates get updated simultaneously , when the user pans/zooms on the figure: this is the functionality I am interested in. It allows me to zoom as much as I like on a specific region and precisely know what are the x,y1,y2 coordinates.

Question : how can I achieve the same result in terms of pan/zoom, in the situation where the y-axis is common while x1 and x2 are different? Specifically, this code does almost what I need:

figure;
x1 = linspace(0,2*pi,1e3); 
x2 = x1 + 1;
y = sin(x1);
[AX,H1,H2] = plotyy(y,x1,y,x2); grid on;
set( get(AX(1),'XLabel'),'String','y-axis' );
set( get(AX(1),'YLabel'),'String','x1-axis' );
set( get(AX(2),'YLabel'),'String','x2-axis' );

set(AX(1), 'Ydir', 'reverse');
set(AX(2), 'Ydir', 'reverse');
view(-90,90);

This figure represents exactly what I need in terms of visualization of data, however I've lost the previous behavior (functionality) of pan/zoom. For instance when I try to pan, the entire figure moves like a block instead of only the data inside it. Any idea how to regain my pan/zoom functionality?

Thank you.