problem with questdlg!!

I want the code run infinite but Here work for two times then he gave me an error the error is ...

Operation terminated by user during movegui (line 157)
In questdlg (line 393)
movegui(QuestFig)
In Project_Test (line 25)
        button = questdlg(promptMessage, titleBarCaption, 'Draw', 'Cancel', 'Draw');

here the code ..

I = imread('--'); %any image
imshow(I);
count=1;
while(1)
          promptMessage = sprintf('Select area!');
          titleBarCaption = 'Continue?!';
          button = questdlg(promptMessage, titleBarCaption, 'Draw', 'Cancel', 'Draw');
          if strcmpi(button, 'Cancel')
              count=count-1;
              break;
          end
          S1 = imrect;
          count=count+1;
end