如何刷新appcelerator中的窗口？

I am developing a ios mobile app.In that mobile app I am showing the gallery. I created gallery in grid format with the help of JSON data.and also i provide a edit icon on that all images and video's of the gallery.if user click on edit icon the image is to be deleted.after that remaining images and video only show in grid format.so to get the non deleted images and videos in grid format we need to refresh the window. so can any one tell me how to refresh the current window in appcelerator ?I am developing a ios mobile app.In that mobile