GLDirectOPenGL in GLScene

Question

I'm using GLScene and have a problem with working GLDirectOPenGL. I want to draw a tringle on a scene but It draw only 3 edge of tringle and cannot to colorise the tringle. As you can see the trinanle has dot style that I dont want and not colorised.

  procedure TMain.GLDirectOpenGL1Render(Sender: TObject; var rci: TRenderContextInfo);
  begin
     gl.Begin_ (GL_TRIANGLES);
     gl.Color4f ( 1,0,0,1);   gl.Vertex3f( -0.13, 0.16,0.15 );
     gl.Color4f ( 0,0,1,1);   gl.Vertex3f( -0.61, 0.31,0.15 );
     gl.Color4f ( 0,1,0,1);   gl.Vertex3f( -0.5, 0.15,-0.1 );
     gl.End_; 
  end;