How to intercept the Copy menu command using an AEGP plugin?

Hey Folks. I'm developing an AEGP plugin, and I would like to know when the Copy menu command has been chosen by the user. My plugin has a large text field with formatted text, and I want to place that text on the clipboard when the Copy command is selected. I could probably register a CommandHook to watch for the Copy command. However, I don't know which command value to watch for.

Do you have any ideas about how I should proceed? Thanks!