I create a new virtual part in an assembly and then set the color of the body I just created using the MaterialProperyValues2.  The color change shows up fine until the part is saved and then re-opened.  Now the color reverts back to the default part color.  Is this a bug?  If so, is there a work around?  Is there a better way to do this?

Here is my code if you wish to repeat the issue.  You will need to select a face of an existing part before running the code for the routine to work:

        public void TestColorIssue()
        {
            //save the selected face
            Face2 fc = (Face2)swSelMgr.GetSelectedObject6(1, -1);
            //create new part
            Component2 newPart;
            swAssy.InsertNewVirtualPart(null, out newPart);
            newPart.Select4(false, null, false);
            int info = 0;
            swAssy.EditPart2(true, false, info);
           
            //*** create a sketch off of all the edges in the selected face and extrude the sketch as a surface
            SelectData data = null;
            Loop2 lp = null;
            object[] loops = (object[])fc.GetLoops();
            if (loops != null)
            {
                for (int l = 0; l < loops.Length; l++)
                {
                    lp = (Loop2)loops[l];
                    if (lp.IsOuter())
                    {
                        break;
                    }
                }
            }
            //set the sketch plane to the face corresponding to this loop
            Entity entLF = (Entity)fc;
            entLF.Select4(false, data);
            SketchManager sketchManager = modelDoc.SketchManager;
            sketchManager.InsertSketch(true);
            Sketch sketch = modelDoc.SketchManager.ActiveSketch;
            modelDoc.ClearSelection2(true);

            //select all the edges for this loop
            bool boolStatus;
            Edge edge;
            Entity entEdge;
            object[] edges = (object[])lp.GetEdges();
            if (edges != null)
            {
                for (int j = 0; j < edges.Length; j++)
                {
                    edge = (Edge)edges[j];
                    entEdge = (Entity)edge;
                    boolStatus = entEdge.Select4(true, data);
                }
            }

            //create the sketch constrained to these edges
            sketchManager.SketchUseEdge2(false);

            // Create a blind surface extrude to the depth of the feature
            FeatureManager myFeatMr = default(FeatureManager);
            myFeatMr = modelDoc.FeatureManager;

            Feature sketchFeature = (Feature)sketch;
            String sketchName = sketchFeature.Name;
            boolStatus = sketchFeature.Select2(false, 0);

            myFeatMr.FeatureExtruRefSurface2(true, false, true, 0, 0, 0.5, 0.5, false, false, false,
            false, 0.01745329251994, 0.01745329251994, false, false, false, false, false, false, false,
            false);

            //clear selection
            modelDoc.ClearSelection2(true);
            //***
           
            swAssy.EditAssembly();
            modelDoc.ForceRebuild3(true);

            //** now go through all the bodies in the part we just created and color them red

            object bodyInfo;
            double[] color = new double[9] {1,0,0,1,1,1,0.3,0,0 };
            object[] bodies = (object[])newPart.GetBodies3((int)swBodyType_e.swAllBodies, out bodyInfo);
            if (bodies != null && bodies.Length > 0)
            {
                for (int i = 0; i < bodies.Length; i++)
                {
                    Body2 body = (Body2)bodies[i];
                    body.MaterialPropertyValues2 = color;
                }

            }
        }