/// <summary>
        /// Draw case solution
        /// </summary>
        public void Draw(Graphics3D graphics)
        {
            if (null == _caseSolution)
                throw new Exception("No case solution defined!");

            // load pallet solution
            BoxProperties caseProperties;

            CasePalletSolution palletSolution = _caseSolution.PalletSolutionDesc.LoadPalletSolution();
            if (null == palletSolution)
                caseProperties = new BoxProperties(null, _caseSolution.CaseLength, _caseSolution.CaseWidth, _caseSolution.CaseHeight);
            else
            {
                CasePalletAnalysis palletAnalysis = palletSolution.Analysis;
                // retrieve case properties
                caseProperties = palletAnalysis.BProperties as BoxProperties;
            }
            if (null == caseProperties) return;
            // draw case (inside)
            Case case_ = new Case(caseProperties);
            case_.DrawInside(graphics);
            // get case analysis
            BoxCasePalletAnalysis caseAnalysis = _caseSolution.ParentCaseAnalysis;
            // draw solution
            uint pickId = 0;
            foreach (ILayer layer in _caseSolution)
            {
                BoxLayer blayer = layer as BoxLayer;
                if (null != blayer)
                {
                    foreach (BoxPosition bPosition in blayer)
                        graphics.AddBox(new Box(pickId++, caseAnalysis.BoxProperties, bPosition));
                }

                InterlayerPos interlayerPos = layer as InterlayerPos;
                if (null != interlayerPos)
                {
                    Box box = new Box(pickId++, caseAnalysis.InterlayerProperties);
                    // set position
                    box.Position = new Vector3D(0.0, 0.0, interlayerPos.ZLow);
                    // draw
                    graphics.AddBox(box);
                }
            }
            // get case analysis
            if (_showDimensions)
                graphics.AddDimensions(new DimensionCube(_caseSolution.CaseLength, _caseSolution.CaseWidth, _caseSolution.CaseHeight));
        }
        /// <summary>
        ///  Use this method when solution does not refer an analysis (e.g. when displaying CaseOptimizer result)
        /// </summary>
        public void Draw(Graphics3D graphics)
        {
            if (null == _boxCaseSolution)
                throw new Exception("No box/case solution defined!");

            BoxCaseAnalysis boxCaseAnalysis = _boxCaseSolution.Analysis;
            // retrieve case properties
            BProperties boxProperties = boxCaseAnalysis.BProperties;
            if (null == boxProperties) return;
            BoxProperties caseProperties = boxCaseAnalysis.CaseProperties;
            // draw case (inside)
            Case case_ = new Case(caseProperties);
            case_.DrawInside(graphics);
            // draw solution
            uint pickId = 0;
            foreach (ILayer layer in _boxCaseSolution)
            {
                BoxLayer blayer = layer as BoxLayer;
                if (null != blayer)
                {
                    foreach (BoxPosition bPosition in blayer)
                        graphics.AddBox(new Box(pickId++, boxProperties, bPosition));
                }
            }
            // get case analysis
            if (_showDimensions)
            {
                graphics.AddDimensions(new DimensionCube(
                    Vector3D.Zero
                    , caseProperties.Length, caseProperties.Width, caseProperties.Height
                    , System.Drawing.Color.Black
                    , true));
                graphics.AddDimensions(new DimensionCube(
                    _boxCaseSolution.LoadBoundingBox
                    , System.Drawing.Color.Red
                    , false));
            }
        }
        /// <summary>
        /// Draw case solution
        /// </summary>
        public void Draw(Graphics3D graphics)
        {
            if (null == _caseSolution)
            {
                throw new Exception("No case solution defined!");
            }

            // load pallet solution
            BoxProperties caseProperties;

            CasePalletSolution palletSolution = _caseSolution.PalletSolutionDesc.LoadPalletSolution();

            if (null == palletSolution)
            {
                caseProperties = new BoxProperties(null, _caseSolution.CaseLength, _caseSolution.CaseWidth, _caseSolution.CaseHeight);
            }
            else
            {
                CasePalletAnalysis palletAnalysis = palletSolution.Analysis;
                // retrieve case properties
                caseProperties = palletAnalysis.BProperties as BoxProperties;
            }
            if (null == caseProperties)
            {
                return;
            }
            // draw case (inside)
            Case case_ = new Case(caseProperties);

            case_.DrawInside(graphics);
            // get case analysis
            BoxCasePalletAnalysis caseAnalysis = _caseSolution.ParentCaseAnalysis;
            // draw solution
            uint pickId = 0;

            foreach (ILayer layer in _caseSolution)
            {
                BoxLayer blayer = layer as BoxLayer;
                if (null != blayer)
                {
                    foreach (BoxPosition bPosition in blayer)
                    {
                        graphics.AddBox(new Box(pickId++, caseAnalysis.BoxProperties, bPosition));
                    }
                }

                InterlayerPos interlayerPos = layer as InterlayerPos;
                if (null != interlayerPos)
                {
                    Box box = new Box(pickId++, caseAnalysis.InterlayerProperties);
                    // set position
                    box.Position = new Vector3D(0.0, 0.0, interlayerPos.ZLow);
                    // draw
                    graphics.AddBox(box);
                }
            }
            // get case analysis
            if (_showDimensions)
            {
                graphics.AddDimensions(new DimensionCube(_caseSolution.CaseLength, _caseSolution.CaseWidth, _caseSolution.CaseHeight));
            }
        }