GeometryModel3D, DrawingBrush and TextureCoordinates

I tried to use DrawingBrush for GeometryModel3D object.

First, I created very simple object (cube without one side) using simple Blue brush, and I could see it. But when I tried to use DrawingBrush, my object became invisible. Apparently, when DrawingBrush is used, TextureCoordinates property for MeshGeometry3D object have to have correct values, and cannot be empty.