I am looking for legal cases that support an irrevocable proxy will be enforced under Delaware law if the proxy is tied to a shareholder voting agreement.. Specifically, I am looking for Delaware authority as to whether a shareholder agreement satisfies the "coupled with an interest" requirement of an irrevocable proxy. Please list out the cases' names.

The questions I try to answer is whether a shareholder agreement will satisfy the requirement that an irrevocable proxy be coupled with an interest.