Question: Who was first wanted to pain the floor wall of the Rockerfeller Center?
About the article "Man at the Crossroads", section "Commission".

Candidate passages:
The World Health Organization (WHO) recommends a "pain ladder" for managing analgesia.
It was first described for use in cancer pain, but it can be used by medical professionals as a general principle when dealing with analgesia for any type of pain.
In the treatment of chronic pain, whether due to malignant or benign processes, the three-step WHO Analgesic Ladder provides guidelines for selecting the kind and stepping up the amount of analgesia.
The exact medications recommended will vary with the country and the individual treatment center, but the following gives an example of the WHO approach to treating chronic pain with medications.
If, at any point, treatment fails to provide adequate pain relief, then the doctor and patient move onto the next step. 
Connected to the south end of St. Patrick Hospital is the Broadway Building, which is a 6 floor medical building with two underground parking lots.
It was completed in March 2002 and has stood as one of the tallest buildings in Western Montana since its completion.
The building replaced the old Broadway Building, and the new building obtained the same name.
The first floor is occupied by The Learning Center medical library, Broadway Pharmacy, a conference center and a Wellness Center.
The second floor includes Broadway Imaging and Lab, Western Montana Clinic Lab and Montana Cancer Center.
The third floor includes a walk way from the hospital at the International Heart Institute of Montana and the floor also offers outpatient services including Providence Medical Group's Women's Care Center, Bariatric Services, Montana Spine & Pain Center, Montana Neurosicence and Neurological Associates.
The fourth floor is occupied by Providence Medical Group's Broadway Internal Medicine, Providence Nephrology and Western Montana Clinic.
The fifth floor includes Western Montana Clinic and Missoula Surgical Associates.
Finally the sixth floor is also occupied by Western Montana Clinic and Now Care. 
Pain Management Center was created in 1985 by Dr. Ming-I Chan Liao, the Executive Consultant, who is a world-renowned pain management specialist that was educated in Japan.
Pain Management Center provides various forms of interventional pain management techniques including CT-guided procedure, Xenon light phototherapy, Stellate Ganglion Block (SGB), etc.
for treatment for patients with herpes zoster (shingles), anosmia (loss of smell), hyperhydrosis (extreme sweating), etc.
In addition to providing immense pain relief for patients world-wide, Pain Management Center maintains its award-winning website (in Chinese) with educational resources on different types of pain management treatments available, the drugs' side effects, and various ways in coping with acute and chronic pain for the people in Taiwan, Hong Kong and China. 
The Rockefellers wanted to have a mural put on the ground-floor wall of Rockefeller Center.
Nelson Rockefeller wanted Henri Matisse or Pablo Picasso to do it because he favored their modern style, but neither was available.
Diego Rivera was one of Nelson Rockefeller's mother's favorite artists and therefore was commissioned to create the huge mural.
He was given a theme: "Man at the Crossroads Looking with Hope and High Vision to the Choosing of a New and Better Future."
Rockefeller wanted the painting to make people pause and think.
Rivera was to be paid $21,000 for the work.
He was officially commissioned by Todd-Robertson-Todd Engineering, the development agents for the building.
The full commission envisaged three murals.
"Man at the Crossroads" would be in the center.
It would be flanked by "The Frontier of Ethical Evolution" and "The Frontier of Material Development".
The central composition was intended to contrast Capitalism and Socialism.
This basic compositional idea was approved by Rockefeller.
Milstein was born to Jewish family in Manhattan and raised in the Bronx.
In 1919, his father Morris Milstein, an immigrant from Russia and who started out as a floor scraper, founded the Circle Floor Company, Inc., a wood flooring company, and in 1945, the Mastic Tile Company, a vinyl floor tile manufacturing company.
In 1941, Milstein graduated from New York University.
He went to work for Mastic Tile becoming president in 1955 while his brother, Paul Milstein, went to work for Circle Floor becoming president in 1961.
In 1959, Mastic Tile, was sold to Ruberoid, for $24 million.
Circle Floor expanded into floor tiles, acoustical ceilings, and drywall construction and won contracts to install flooring in several New York landmarks including Rockefeller Center, the United Nations Building, and both John F Kennedy Airport and LaGuardia Airport.
By 1966, Circle Floor was the nation's largest subcontractor of floor, wall and ceiling construction.