xcode - Can't Add Large Icons to Asset Catalog -

xcode - Can't Add Large Icons to Asset Catalog -

i trying add together images app icon project using asset catalogs. version of osx 10.9.3 , version of xcode 5.1.1. apple documentation states can drag , drop images set boxes in asset catalogs folder. however, many of drag , drop boxes cutting off , cannot horizontally scroll:

am doing wrong or bug? couldn't find way add together files specified size in appicon set. there way it?

thanks!

you can prepare problem hiding side bar top of screen. reveal image drops. so, dropping images in should auto-sort them right place

xcode osx xcode5