How to use multiple popup menu in a GUI?

I have a picture that i want to split it .i wrote below code.

 for example if i want to split picture into 5X3 just i should put X=5 and y=3 in that. but i want to do that by GUI.

i created two pop-up menu for selecting number of rows(1-10) and column(1-10) in GUI, but i don't know how can i manage this code whit two pop-up menu in GUI? TQ

 %if 
  %end
clear
rgbImage=imread('C:\safa\flower1.jpg');
x=7;y=8;
[rows columns numberOfColorBands] = size(rgbImage);
interval1=floor(columns/y);
interval2=floor(rows/x);
for i=0:y-1
    val1(i+1)=1+(i*interval1);
end
for j=0:x-1
    val2(j+1)=1+(j*interval2);
end
val1(1,end)=val1(1,end)-1;
val2(1,end)=val2(1,end)-1;
kk=0;
for jj=1:x
    for ii=1:y
        kk=kk+1;
        q(:,:,:,kk)=imcrop(rgbImage, [val1(ii) val2(jj) interval1 interval2]);
    end
end
for jjj=1:x*y
    subplot(x,y,jjj)
    imshow(q(:,:,:,jjj))
end