Coaching V Teaching

I'm constantly challenged by how managers confuse teaching as coaching. When I ask managers to list all the activities they think are coaching, the list contains, showing their people how to do it, answering their questions, leading by example, dealing with their most difficult issues, writing proposals and the list goes on.  No where do they list, asking questions.  One of the simplest questions to ask is "so what ideas do you have?".  Simple, yet powerful, managers who adopt this begin to engage the thinking capacity of their people, the very capacity that you as a manager identified in them before hiring them. Then why is that we as managers default to teaching as opposed to coaching?