🚀 go-pugleaf

Can anyone please help me with the following question regarding Unidraw?

What should I do to create and draw an object
(say, a line) using a command rather than a tool? I can create a 
LineComp and LineView but then how should I include them into the 
hierarchy? I thought they should be children of the editor's component,
but Append (a function that appends a new child) is a private function.
So, it seems it is not intended to be used this way. Also,
LineComp and LineView have a graphic object that also may have a parent.
What should it be and how to set it?

Another, more C++ question is this. When you do

GraphicComp* comp = GetEditor()->GetComponent();
comp->Interpret(command);

the function that gets executed is GraphicComps::Interpret.

But GetComp returns Component, and the actual variable _comp that it
returns is declared as GraphicComp. So, I would expect the function
GrachicComp::Interpret to get executed, not GraphicComps::Interpret.
What's the catch?

Thanks for your help.
Irina.