Usually the solution to blind shoots is to cut them back some and let them grow out again. The second time around they should put on buds. If you had a bad winter or any kind of odd weather during the spring growing season it could by why it put on so much blind growth.

I'm assuming the proper name is 'Sunny Knock Out'. I'm also assuming that you bought the rose as a grafted/budded plant. What may have happened is that a sucker of the rootstock (probably 'Dr. Huey') has grown, and that is the tall cane you're seeing with no flower buds. 'Dr. Huey' blooms on old wood, and naturally grows as a small climber. Look at your rose to see if the tall cane is coming from below the graft/bud union. If so, it needs to be removed.

:-)

~Christopher