Visualizing large hierarchized graphs is such a challenging task that it is hardly possible to represent all relevant information within a single comprehensible image. To address that challenge, we pursue multiple linked view visualization. We report on a visualization framework for exploring hierarchized graphs that focusses on a modular architecture based on the model-view-controller (MVC) concept. MVC helps us in coordinating views, as users explore and navigate the data. Several interaction facilities further support users in applying the framework for their data and their task at hand.