gwt - How to clear and redraw the entire map -

i using gwt , google maps api v3. able render map inside simple panel overlays custom shapes. if new query provided want clear panel , render map again.

public resultspanel(scolopaxcontroller _controller,         scolopaxconstants _constants) {     super();     controller = _controller;     layout = new simplepanel();     paging = new horizontalpanel();     paging.setwidth("100%");     paging.setspacing(0);     layout.add(paging);     this.setwidget(paging);  } //after processing values in server method called public void setplots(plotsetoutput result) {     this.page = 1;     this.loadmapapi(result);     controller.getscolopaxgui().addresultstab(); }  private void loadmapapi(final plotsetoutput result) {     paging.clear(); // not work     // load libs use in maps     arraylist<loadlibrary> loadlibraries = new arraylist<loadapi.loadlibrary>();     loadlibraries.add(loadlibrary.adsense);     loadlibraries.add(loadlibrary.drawing);     loadlibraries.add(loadlibrary.geometry);     loadlibraries.add(loadlibrary.panoramio);     loadlibraries.add(loadlibrary.places);     loadlibraries.add(loadlibrary.weather);     loadlibraries.add(loadlibrary.visualization);     runnable onload = new runnable() {         @override         public void run() {             draw(result);         }     };      loadapi.go(onload, loadlibraries, sensor); }  private void draw(plotsetoutput result) {     drawheatmap(result); }  private void addmapwidget(widget widget) {     paging.add(widget); }  private void drawheatmap(plotsetoutput result) {     displayonmap wmap = new displayonmap(result);     addmapwidget(wmap); } 

this displayonmap method

    private final verticalpanel pwidget;     private mapwidget mapwidget;     private static rectangle rectangle;     private static final latlng uscenter = latlng.newinstance(33.68,-116.17);      public displayonmap(plotsetoutput result) {         pwidget = new verticalpanel();         initwidget(pwidget);         draw(result);     }      private void draw(plotsetoutput result) {         mapoptions mapopts = mapoptions.newinstance();         mapopts.setzoom(4);         mapopts.setcenter(uscenter);         mapopts.setmaptypeid(maptypeid.terrain);         mapwidget = new mapwidget(mapopts);         pwidget.add(mapwidget);         mapwidget.setsize("800px", "800px"); .... } 

i tried clear pagging panel when server called setplots method. tried clear pwidget panel nothing works. output looks when second query called