Image Load,imContour and display in GUI

Hello i'm building this GUI and i need a little help!In my GUI i want to have a push button which would do this : a=imread('C:\Users\ADMIN\Desktop\canada.bmp'); level=graythresh(a); bw=im2bw(a,level); imgcon=imcontour(bw); and then i want this contour image to be shown in a figure or plot but seperatly. When i'm writting this code it always show's the image on the figure! i want to do it with 4 different images.please help NOTE THAT IMAGES ARE BITMAPS!!!