A base ICommand implementation that executes other ICommands asynchronously.

An AsyncMacroCommand maintains a list of ICommand Class references called SubCommands.

When execute is called, the AsyncMacroCommand caches a reference to the INotification and calls nextCommand.

If there are still SubCommands's to be executed, the nextCommand method instantiates and calls execute on each of its SubCommands in turn. Each SubCommand will be passed a reference to the original INotification that was passed to the AsyncMacroCommand's execute method. If the SubCommand to execute is an IAsyncCommand, the next SubCommand will not be executed until the previous IAsyncCommand has called its commandComplete method.

Unlike AsyncCommand and SimpleCommand, your subclass should not override execute, but instead, should override the initializeAsyncMacroCommand method, calling addSubCommand once for each SubCommand to be executed.