ArcEngine开发鹰眼实现问题

在网上百度一下有关AE鹰眼实现的代码，基本是一样的，可问题是好多代码自己运行起来鹰眼却总是加不进地图。住视图axMapControl1.OnMapReplaced(),axMapControl1.OnExtentUpdated(),axMapControl2.OnMouseDown(),axMapControl2.OnMouseMove()在这几个事件绑定的委托方法里写代码，能够实现鹰眼所必须的功能。问题看似简单，代码也不难理解，可往往别人的代码到我们这里却总是会出现很多bug，问题是什么，我现在也不知道，为什么鹰眼地图总是加不进去，按理说代码改来改去都觉得问题不大应该可以实现，可就是无法显示，蛋疼的很。这也就是我们看别人代码思路感觉都对着，可往往在我们实际去做，总是会出现各种各样的不如人意。哎，不说了，把那经典的代码贴下来，那天返回来再看吧。现在我只有用比较笨的硬拷贝方法来实现鹰眼的显示联动问题了。

        private void axMapControl2_OnMouseDown(object sender, ESRI.ArcGIS.Controls.IMapControlEvents2_OnMouseDownEvent e)
        {
            if (axMapControl2.Map.LayerCount > )
            {
                if (e.button == )
                {
                    IPoint pPt = new PointClass();
                    pPt.X = e.mapX;
                    pPt.Y = e.mapY;
                    IEnvelope pEnvelope = axMapControl1.Extent as IEnvelope;
                    pEnvelope.CenterAt(pPt);
                    axMapControl1.Extent = pEnvelope;
                    axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);

                }
                else if (e.button == )
                {
                    IEnvelope pEnvelope = axMapControl2.TrackRectangle();
                    axMapControl1.Extent = pEnvelope;
                    axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);
                }
            }
        }

        private void axMapControl2_OnMouseMove(object sender, ESRI.ArcGIS.Controls.IMapControlEvents2_OnMouseMoveEvent e)
        {
            if (e.button != )
                return;
            IPoint pPt = new PointClass();
            pPt.X = e.mapX;
            pPt.Y = e.mapY;
            axMapControl1.CenterAt(pPt);
            axMapControl2.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);
        }

        private void axMapControl1_OnMapReplaced(object sender, ESRI.ArcGIS.Controls.IMapControlEvents2_OnMapReplacedEvent e)
        {
            if (axMapControl1.LayerCount > )
            {
                //IMap pMap = axMapControl1.Map;
                axMapControl2.Map = new MapClass();

                for (int i = ; i <= axMapControl1.Map.LayerCount - ; i++)
                {
                    //axMapControl2.Map.AddLayer(pMap.get_Layer(i));
                    axMapControl2.AddLayer(axMapControl1.get_Layer(i));
                }
            }
            axMapControl2.Extent = axMapControl1.FullExtent;
            axMapControl2.Refresh();
        }

        private void axMapControl1_OnExtentUpdated(object sender, ESRI.ArcGIS.Controls.IMapControlEvents2_OnExtentUpdatedEvent e)
        {
            IGraphicsContainer pGraphicsContainer = axMapControl2.Map as IGraphicsContainer;
            IActiveView pAV = pGraphicsContainer as IActiveView;
            pGraphicsContainer.DeleteAllElements();
            IRectangleElement pRecElement = new RectangleElementClass();
            IElement pEle = pRecElement as IElement;
            IEnvelope pEnv;
            pEnv = e.newEnvelope as IEnvelope;
            IRgbColor pColor = new RgbColorClass();
            pColor.Red = ;
            pColor.Green = ;
            pColor.Blue = ;
            pColor.Transparency = ;
            //产生一个线符号对象
            ILineSymbol pLineSymbol = new SimpleLineSymbolClass();
            pLineSymbol.Width = ;
            pLineSymbol.Color = pColor;
            //设置填充符号属性
            IFillSymbol pFillSymbol = new SimpleFillSymbolClass();
            //设置透明颜色
            pColor.Transparency = ;
            pFillSymbol.Color = pColor;
            pFillSymbol.Outline = pLineSymbol;
            IFillShapeElement pFillShapeElement = pRecElement as IFillShapeElement;
            pFillShapeElement.Symbol = pFillSymbol;
            pGraphicsContainer.AddElement(pEle, );

            axMapControl2.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);
        }

why it doesn't run ?