Fine Grained Behaviour can not be selected for Call Parameters
In the current Editor it is impossible to select the Fine Grained Behaviour for a Call Parameter, since they have no name:
https://www.dropbox.com/s/w2vxyyeqj0va67g/Screenshot%202015-06-22%2011.25.40.png?dl=0
Current workaround for me is to select a random Fine Grained Behaviour, then open the file in a texteditor and manually change the reference