This presentation shows how using UI toolkits that a) have broad and deep functionality exposed by a powerful design-time interface and b) that are "pattern aware" is a winning strategy for UX driven development. Firstly, they minimise the disconnect between the customer, UX practictioner and developer by enabling the easy creation of high-fidelity prototypes. Secondly, they address the challenges of time, budget, developer ability and the growing need to target multiple devices.