AE draws polygon and plane on mapconntrol

        ///   <Summary>          ///  Draw a polygon and a plane on mapcontrol.  ///   </Summary>          ///   <Param name = "activeview"> </param>          Public   Void  Drawpolygon (ESRI. ArcGIS. Carto. iactiveview activeview ){  If (Activeview = Null  ){ Return  ;} ESRI. ArcGIS. display. iscreendisplay screendisplay = Activeview. screendisplay;  //  Constant Screendisplay. startdrawing (screendisplay. HDC, (system. int16) ESRI. ArcGIS. display. esriscreencache. esrinoscreencache ); //  Explicit cast ESRI. ArcGIS. display. irgbcolor rgbcolor = New  ESRI. ArcGIS. display. rgbcolorclass (); rgbcolor. Red = 255 ; ESRI. ArcGIS. display. icolor color = Rgbcolor; //  Implicit cast ESRI. ArcGIS. display. isimplefillsymbol simplefillsymbol = New  ESRI. ArcGIS. display. simplefillsymbolclass (); simplefillsymbol. Color = Color; ESRI. ArcGIS. display. isymbol symbol = Simplefillsymbol As ESRI. ArcGIS. display. isymbol; //  Dynamic cast  // ESRI. ArcGIS. display. irubberband rubberband = new ESRI. ArcGIS. display. rubberpolygonclass ();  //  Polygon ESRI. ArcGIS. display. irubberband rubberband = New ESRI. ArcGIS. display. rubberlineclass (); //  Line  ESRI. ArcGIS. Geometry. igeometry Geometry = Rubberband. tracknew (screendisplay, symbol); screendisplay. setsymbol (Symbol );  //  Screendisplay. drawpolygon (geometry); Polygon Screendisplay. drawpolyline (geometry); screendisplay. finishdrawing ();}  Private   Void Axmapcontrolpoliconmousedown ( Object  Sender, ESRI. ArcGIS. Controls. imapcontrolevents2_onmousedownevent e) {drawpolygon (  This  . Axmapcontrol1.activeview );}