I'm using Blender 2.74 and trying to follow an online video tutorial on creating "sun" (presenter is using version 2.63). The problem I'm facing is that the presenter just selected a few nodes in the Nodes Editor and pressed Ctrl + G to group those nodes. Then he pressed TAB to edit the group and remove some of the input sockets of the GroupInput node by clicking the cross button in front of those sockets. Now I do not see these cross buttons in my version of Blender. I tried using Properties window too (N key) but that also doesn't allow removing (although it does allow adding, renaming and reordering). Can anyone help me with this?