Почему при работе AcEdJig идет двойная перерисовка примитива? (Страница 1 из 2)

pClone->erase();
pClone->close();

delete pClone();

class CExContainerJig : public AcEdJig
    {
    public:
        
        CExContainerJig (AcDbDatabase *pDb, AsdkContainerBlock * pContainerBlock):
          mpContainerBlock(pContainerBlock), mpDb(pDb)
              {
              };
        virtual ~CExContainerJig()
            {
            };
        void dragIt(void)
            {
            AcEdJig::DragStatus stat;
            const TCHAR*pszPrompt2 = _T("\n\n\n*** Container block extension ***\n Please set base point: ");
            setDispPrompt(pszPrompt2);
            
            do
                {
                    stat = drag();
                    if (stat == AcEdJig::kNormal)
                    {
                        mpContainerBlock->RemoveContainer(coords.x+1,coords.y+1);
                    }
                } while (stat != AcEdJig::kCancel && stat != AcEdJig::kNull);
            pszPrompt2 = NULL;
            };
        DragStatus acquireDefPt()
            {
                AcEdJig::DragStatus stat;
                  setUserInputControls((UserInputControls)
                (AcEdJig::kAccept3dCoordinates
                | AcEdJig::kGovernedByOrthoMode
                | AcEdJig::kNullResponseAccepted
                | AcEdJig::kNoZeroResponseAccepted
                | AcEdJig::kDontUpdateLastPoint));
                AcGePoint3d pt;
                stat = acquirePoint(pt);
//                stat = kNoChange;
        if (stat == kNormal)
        {
            
            if (coords != mpContainerBlock->RetreiveContainerCoords (pt))
            {
                ContainerPointer = pt;
                stat = kNormal;            
            }
            else
            return kNoChange;
        }
        
        return stat;
            };
        virtual DragStatus sampler (void)
        {
            return acquireDefPt();
        };
        virtual Adesk::Boolean update()
            {
                coords = mpContainerBlock->RetreiveContainerCoords (ContainerPointer);
//                ads_printf("column: %d, row: %d, X: %.2f Y: %.2f\n",coords.x, coords.y,ContainerPointer.x,ContainerPointer.y);
                if ((coords.x*coords.y < 0) ||((coords.x+1)>mpContainerBlock->GetColumnsNumber())||((coords.y+1) >mpContainerBlock->GetRowsNumber()))
                    return Adesk::kFalse;
                return Adesk::kTrue;
            };
        virtual AcDbEntity * entity() const
            {
                return mpContainerBlock;
            };
        
    private:
        AsdkContainerBlock * mpContainerBlock;
        AcDbDatabase *mpDb;
        AcGePoint3d ContainerPointer;
        CPoint coords;
    public:
        // -----------------------------------------------------------------------------
        AcEdJig::DragStatus drag(void);
    };
// -----------------------------------------------------------------------------
AcEdJig::DragStatus CExContainerJig::drag(void)
{
    AcEdJig::DragStatus retCode =AcEdJig::drag () ;
    return (retCode) ;
}