Xcode 6.1 , Storyboard, Ctrl+Drag doesnt work, not even blue line

I just upgraded to XCode 6.1

I started to create a Mac, Cocoa application.

In story board, i put a button on view controller, and tried to CTRL+DRAG it to the source code.

Problem is that it doesn't work, at least i have to see the blue line despite of where im going to drop it, but nothing happens at all and blue line doesnt appear and control stays put :-s

What am i doing wrong?