Draw a line with Custom Geometry in 2D

Hello there, I need some help. I’m trying to draw a simple line with CustomGeometry class using 24_Urho2DSprite example, but I’m failing at it. I removed all other drawing code (that about sprites) and left a black screen. Then I’m adding the following code:

// custom geometry

auto scp = camera->ScreenToWorldPoint(Vector3(0.5f,0.5f,-1));

Node* lineNode = scene_->CreateChild("lineNode");
CustomGeometry* cg = lineNode->CreateComponent<CustomGeometry>();
cg->Clear();
cg->SetNumGeometries(1);
cg->BeginGeometry(0, PrimitiveType::LINE_LIST);
//    cg->DefineGeometry(0, PrimitiveType::POINT_LIST, 3, false,false, false, false);
cg->DefineVertex(Vector3(0,0,0));
cg->DefineVertex(Vector3(10,10,0));
cg->DefineColor(Color::WHITE);
//cg->SetMaterial(<#Urho3D::Material *material#>); ??? is there a default material?
cg->Commit();

lineNode->SetPosition(scp);

What am I missing?

Maybe try a material with fill set to wireframe?

Added

Material* mat = new Material(context_);
cg->SetMaterial(mat);

and this gave out:

the subtle white thin line. Every material fill gave the same.
Thank you. Looks like custom geometry is an easy input for this kind of things.
Now I have to find a suitable tessellator, and some geometry generator.

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