What's the difference between having a view and clinging to a view?

The Buddha said that clinging is stress. Also, that there are four kinds of clinging: "Monks, there are these four clingings. Which four? Sensuality clinging, view clinging, habit-&-practice clinging, and doctrine-of-self clinging." But basically, they are all **view** clinging. A useful view in one context can be a harmful one in another. How can one "know" the difference? How can one "know" that one is not just *clinging* to a preference? What's the difference between having a view and clinging to a view? P.S. Some very interesting answers, but *no references* yet. I was hoping for some insight from the Buddha, or possibly a contemporary Dhamma master.