private void ObserveChanges()
{
RequestQuote = new DelegateCommand(
_ => _router.PublishEvent(new RequestQuoteEvent()),
_ => Notional.HasValue && CurrencyPair.HasValue && _status != QuoteStatus.Quoting
);
AcceptQuoteCommand = new DelegateCommand(
_ => _router.PublishEvent(new AcceptQuoteEvent(_quoteId)),
_ => _status == QuoteStatus.Quoting
);
RejectQuoteCommand = new DelegateCommand(
_ => _router.PublishEvent(new RejectQuoteEvent(_quoteId)),
_ => _status == QuoteStatus.Quoting
);
Notional
.ObserveProperty(q => q.Value)
.Where(_ => !_entryMonitor.IsBusy)
.Subscribe(quantity => _router.PublishEvent(new NotionalChangedEvent(quantity)));
CurrencyPair
.ObserveProperty(q => q.Value)
.Where(_ => !_entryMonitor.IsBusy)
.Subscribe(symbol => _router.PublishEvent(new CurrencyPairChangedEvent(symbol)));
}