impixelinfo - function only works once

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Jason
Jason 2014-3-25
编辑： Jason 2014-3-25
Hello. I am using Guide to display an image that I have previously stored in memory.
setappdata(0,'Zoom',Zoom);
axes(handles.axes2)
axis off;
me=mean(Zoom(:));
sd=std2(Zoom(:));
low = me - sd;
high = me+3*sd;
imshow(Zoom,[low, high])
I amt hen able to hold my mouse over the image and have the coordinates and intensity values displayed by using
hp = impixelinfo;
set(hp,'Position',[5 1 300 20]);
This is all performed in a listbox callback. the listbox cotnains several images.
when I recall with a different image, whilst the new image is displayed, the imagepixel info doesn't work, in fact, the text just disappears. Is there a refresh that I need to do. I have tried drawnow, or is there something else wrong.
Thanks for any help

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