How can I display a plot in gui from another mfile?

Hi,

I have an mfile that creates a plot H and creates a figure. And within that file, I did setappdata(0, 'Figure', H);

In my gui file I have an axes (with the tag axes2) and I'm trying to get the plot H from my other mfile by calling H = getappdata(0, 'Figure');

I'm not very familiar with guis so I don't know how I can display the plot I created in my gui? I tried imshow(H, 'Parent' handles.axes2); but that didn't quite work. Could anyone help with this? Or know a better way?

Thank you so much!