To shake hands to introduce themselves as a tradition. For the people of Canada are not kiss or hug when they met in front of each other, as well as the people of Canada are not wearing hats and shoes in the House.
The handshake is customary to introduce myself. For Canadians to have a kiss or a hug in the same page. The Canadians do not wear hats and shoes in the house.
Holding hands in the introduction is tradition. For Canadians, there will be no kissing and hugging in time to see each other. As well as the Canadians will not wear hats and shoes in the house.