A system and method are described for changing window's functionality upon detecting resizing events. According to one example method, a plurality of size thresholds is defined that are associated with a plurality of functional states for a window. Upon detecting that a size of a window reaches a first size threshold, a first functional state is applied to a window. Then, upon detecting another size threshold as the window is being increased or decreased in size, another functional state associated with the detected threshold is applied to the window.