The drag and drop functionality of GWT is en- hanced with several features (highlighting of drop- pable areas, etc.) and various wrapper classes are provided for data visualization (DragWindow, ChartWrapper, etc.). To show the potential of the visualization framework, some modules covering various use cases were implemented. For example, the chart module allows creating trend charts from any datapoint by dropping the datapoint on the mod- ule. An export module is intended to be imple- mented to show how data can be requested based on various rules (e.g. only workdays, only defined time slots, etc.). Currently, data visualization possibilities within a two or three dimensional building model are being explored.