TV doctor Robert Sean Leonard has poured praise on his HOUSE co-stars Jennifer Morrison and Jesse Spencer for remaining "civil" on the set after calling off their engagement. The actor insists both should be commended for their professionalism - because he wouldn't be able to deal with such a public split. He says, "They're quite civil. They're either very professional or very mature. "If I broke up with someone on the set, there would be pans flying. "They'll hate me for saying this, but they're both incredibly sweet." Morrison accepted Spencer's proposal in December 2006, but called off their engagement in August (07).