Xcode 4.3.3: cannot change autosizing inner markers (springs & struts)
===

I want to change the spring & struts setting in the storyboard (xcode 4.3.3)
 
Currently, in the size inspector (autosizing), two struts are active (outer markers) - the top and the left makers, with zero springs (inner makers) are active. 

I would like to activate both the inner markers, but xcode currently does not allow me to click them. 

If I create a new ViewController and UIView, I can change the autosizing for the new one.
But ideally, I would like to know how to be able to fix this issue, without creating a new storyboard from scratch. 

Does anyone know what is causing this?

Thanks,
