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Is this possible? I would like something like click on port, drag to other port, finished! So clicking + dragging anywhere else is not possible.

Each shape and port class has a Direction property which can be set to In, Out or None.If you set all the shapes to None, lines cant be docked by the user. 

 But this does not stop you from drawing undocked lines on the model, which is what I want to avoid.

 I guess you would have to override UpdateElements in Model class. It is called just before any changes are commited (at least this is how I see it), and you can ignore or modify the changes that are to be done to the model.

You need to inspect RenderDesign.Actions and discard them if there is a line to be created that is not docked to any element or port. I do have similar mechanism in my implementation and it works very well, but I've done it a long time ago, so I'm not sure if I gave you enough information.

Best regards,
Ireneusz Patalas
 

 I solved it like this:

        protected override void OnMouseDown(System.Windows.Forms.MouseEventArgs e)
        {
            if (Runtime.InteractiveMode != InteractiveMode.AddConnector || CurrentMouseElements.MouseMoveElement is Port)
            {
                base.OnMouseDown(e);
            }
        }

        protected override void UpdateElements()
        {
            object o = RenderDesign.Actions[0];
            if (o is Connector)
            {
                Connector c = (Connector)o;
                if (!(c.End.Port is Port))
                {
                    Lines.Remove(c.ActionElement.Key);
                    RenderDesign.Actions.RemoveAt(0);
                }
            }
            base.UpdateElements();
        }