public GraphViewModel(IInspectorTool inspectorTool)
{
DisplayName = "[New Graph]";
_elements = new BindableCollection <ElementViewModel>();
_connections = new BindableCollection <ConnectionViewModel>();
_inspectorTool = inspectorTool;
var element1 = AddElement <ImageSource>(100, 50);
element1.Bitmap = BitmapUtility.CreateFromBytes(DesignTimeImages.Desert);
var element2 = AddElement <ColorInput>(100, 300);
element2.Color = Colors.Green;
var element3 = AddElement <Add>(400, 250);
Connections.Add(new ConnectionViewModel(
element1.OutputConnector,
element3.InputConnectors[0]));
Connections.Add(new ConnectionViewModel(
element2.OutputConnector,
element3.InputConnectors[1]));
element1.IsSelected = true;
}