Make the pause button and stop.

This loop process I put into the start button.

 while(vid.FramesAcquired<=200)

    data = getsnapshot(vid);
    diff_im = imsubtract(data(:,:,1), rgb2gray(data));
    diff_im = medfilt2(diff_im, [3 3]);
    diff_im = im2bw(diff_im,0.18);
    diff_im = bwareaopen(diff_im,300);
    bw = bwlabel(diff_im, 8);
    stats = regionprops(bw, 'BoundingBox', 'Centroid');

    imshow(data)

    hold on

    for object = 1:length(stats)
       bb = stats(object).BoundingBox;
       bc = stats(object).Centroid;
       rectangle('Position',bb,'EdgeColor','r','LineWidth',2)
       plot(bc(1),bc(2), '-m+')
       a=text(bc(1)+15,bc(2), strcat('X: ', num2str(round(bc(1))), '    Y: ', num2str(round(bc(2)))));
       set(a, 'FontName', 'Arial', 'FontWeight', 'bold', 'FontSize', 12, 'Color', 'yellow');
    end

    hold off
end

but I want to make the pause button and stop. What script should I use?