Understanding problem with TopoDS_Shape

Hi,

I finally got the Euler angles thing figured out. This works quite well: I load a step file (SC_Setup00.jpg), which results in a misoriented model. I then rotate that to the desired position (SC_Setup01.jpg) and press "Set" (SC_Setup02.jpg).

  gp_Trsf t = model->Transformation();
  const TopoDS_Shape& base = model->Shape();
  TopoDS_Shape nModel = base.Located(TopLoc_Location(t));

  view3D->removeShape(model);
  model = new AIS_Shape(nModel);

Hereby the new position and orientation of the model becomes the new base position, i.e. new transformations start with the base position - so exactly what I wanted.

Unfortunately, the same procedure does not work for the workpiece. I create a box based on the bounding box. Then I change size and position until it fits for me.

When I then execute "Set" (same sequence as for the model), the box jumps back to zero with a corner (SE_Setup03.jpg). Of course, this is not the way I want it.

How can I prevent this, or what have I overlooked?

P.S.: is it possible to embed uploaded images in the post? - if so, how?