Question
LAST YEAR I PURCHASED A KNOCKOUT ROSE TREE.  I KEPT IT IN A POT
IN THE HOUSE OVER THE WINTER AND IT BLOOMED MOST OF THE WINTER.
I PLANTED IT IN THE GROUND IN EARLY MAY. IT IS NOW JUNE 23 AND THERE IS NO FOLIAGE ON THE PLANT AND NO SIGNS OF GROWTH.  THE TREE STEM AND BRANCHES DO NOT LOOK DEAD.  HOW CAN I DETERMINE IF IT IS STILL LIVING.  
BETTER YET IS THERE ANY THING I CAN DO TO PRESERVE IT.

I LIVE IN PITTSBURGH PA.

THANK YOU IN ADVANCE.

Answer
The rose was used to greenhouse conditions and was acting like a tender rose. Which means it had not built up any resistance to cold soil or cold weather in comparison to the house climate. Planting it the garden has made it go under stress. However it should be showing signs of some growth by now. Take your fingernail and scratch the bark and see if it is green underneath. Also cut off a small piece of a canes and see if the  center of it is a pale green. If the underbark and the canes insides are green, then the rose is just suffering shock and will recover. Don't give it any fertilizer as it can't take it up just make sure the soil is always damp around the roots. Stress takes time to activate the system to get going again just be patient and in time if it is okay, growth will start.