With the advent of adoption of an interactive digital TV standard by the Brazilian government, the interest for the analysis of possible alternatives in several areas that compose a digital TV system has increased. In the case of Brazil, NCL is the declarative language adopted for modeling interactive applications in the Brazilian Terrestrial Digital TV System (ISDTV-T - International System for Digital TV). In that context, this work presents Composer, an authoring tool to create NCL documents for interactive digital TV. In the same way that in the HyperProp editor, in which it is based, in Composer the abstractions are defined using views that allow to simulate a specific type of edition (structural, temporal, layout and textual). Those visions work in a synchronized way, in order to offer an integrated authoring tool. Besides having the user and the functional interface remodeled, mainly its temporal view, problems of representation and edition of media objects, relationship problems, amongst then the interactive relationships, and live edition are treated. In summary, the proposed system tries to make easier the creation of documents for digital TV abstracting from the author all, or at least some complexity of programming in NCL using this authoring tool.