Habanero Faces has the Capability to Dynamically generate User interfaces. This is a powerful mechanism that if used correctly can result in the developer having to do very little maintenance of his/her User interface and No Dragging and dropping. The way that this is achieved is via Control Mappers. A Control Mapper maps a property or relationship of the Business Object to a Control on the User interface and will handle all updating and communication between the control and the Business Object. Think of it like binding on steroids. For more info on Control Mappers check out the Habanero Wiki  on Manipulating User Interfaces as well as Peter’s article Dynamically Generating User Interfaces.