I cannot follow you in the first sentence already: A push button can change a specific picture via a popupmenu? Are there unspecific picturs also? How does the push button interact with a popup menu? The next sentence is strange also: Resizable push buttons?
The image is displayed as the background of a button? Then it is displayed pixel by pixel and you cannot resize it automatically. This would be the same if you use the CData property directly.
Now S.imagex is an image with the callback @imagex_call.
No, S.imagex is the handle of a button.
I had another function change the pixel count for hS2
Please post the code when you want the readers to understand, what this mean.
I think, you have chosen the wrong way. Displaying images in a button works somehow, but it is neither convenient nor powerful. An auto-resizing will not work.
You can try it the other way around: Create an image in an invisible axes and use its ButtonDownFcn as callback. Then the resizing is easy and you can use it as push button. If you like the position of the image can be shifted temporarily in the callback to get the look&feel of a button.
Alternatively you can store the image data in e.g. the UserData of the button and then use the ResizeFcn of the figure to update the CData of the button by a imresize 'd version of the image.
