Is it possible to copy a primitive in SceneComposer window?

I try to edit my scene using SceneComposer. I need to add many primitives for testing (boxes). I have added a box. I press right mouse button on it and select “copy”. After that I select the Scene Root and press the right mouse button on it. But the “paste” line is gray. To copy a simple primitive I need to add a new one and paste in it all the properties (line after line) from the template to the new primitive. Is it a normal behavior? How can I make copies of simple primitives in the SceneComposer-window? I use Kubuntu 64 bit.