public MainViewModel()
{
// set some views and datacontext
LinesView = new GRLinesView();
LinesView.DataContext = new LinesViewModel();
CircleView = new GRCircleView();
CircleView.DataContext = new CircleViewModel();
EllipseView = new GREllipseView();
EllipseView.DataContext = new EllipseViewModel();
RangeView = new GRRangeView();
RangeView.DataContext = new RangeViewModel();
// load the configuration file
DistanceAndDirectionConfig.AddInConfig.LoadConfiguration();
}