The header of the Commands.
Fields - Variables which can only be accessed from an object returned by a constructor
cp.apple.finalcutpro.cmd.Commands.Header.command <cp.ui.Button>
Button
cp.apple.finalcutpro.cmd.Commands.Header.key <cp.ui.Button>
cp.apple.finalcutpro.cmd.Commands.Header.modifiers <cp.ui.Button>