Image component does not see images in "assets" (new ui)

http://sd.uploads.im/Yd05o.jpg

On all my ui elements with Image component, if I try to choose Source Image, i get a situation on the screenshot: short list of simple icons and none of my images, that are in “assets” folder. I also can not drag any images on theese elements. Why can it be? Am i doing something wrong?

You didn’t change the texture type of your UI images to “sprite”.