The data of the DrawPanel. Its holds the whole data of one scenario.
container of all ScenarioElements, separates the real panelModel (Topography)
from the PanelModel (that holds information about selection, color, scaling and so on).this is the scalingfactor for the obstacles, targets and sources (if the user want to scale
the topography).
Not only a view-attribute.a copy of the topography element that will be moved, can be null.the last copied element, can be null.indicate that the prototype is availible != null and visible.Font to be used to display statistical informations.the stack of accessed categories