Recently I was asked to evaluate my manager's work. One of the questions was whether he is a "tell and sell" person (I don't remember the exact phrase however). I'm not sure what this idiom means (or whether it is an idiom at all), but my initial understanding was that this means a kind of person who never accepts other points of view. Later I thought that this could mean something different, for example a person who does what he says.
I'm not a native speaker, so I would like to know, does the idiom exist, and what does it mean exactly.