I happen to get the same message while adding a Map on runtime, to a
Panel custom component. The latter is included in an MXML Application.

Adding a maps:Map component works fine.

Any ideas?

Thanks,
Pablo Apanasionek

<mx:Panel xmlns:mx="http://www.adobe.com/2006/mxml";
        xmlns:controls="controls.*"
        borderThicknessTop="0"
        borderThicknessLeft="0"
        borderThicknessRight="0"
        borderThicknessBottom="0" xmlns:maps="maps.*">

        <mx:UIComponent id="map" width="100%" height="100%" />

        <mx:Script>
                <![CDATA[
                        import com.google.maps.Map;

                        private var mapImpl:Map;

                        public function setMapControl():void
                        {
                                mapImpl = new Map();
                                mapImpl.key = MY_KEY;
                                map.addChild(mapImpl);
                        }

                ]]>
        </mx:Script>

</mx:Panel>

On Oct 24, 1:31 pm, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
wrote:
> The solution is to create a UIComponent container for the map.  This
> works as in the sample below as well as in a popup:
>
> <?xml version="1.0" encoding="utf-8"?>
> <mx:Application
>         xmlns:maps="com.google.maps.*"
>         xmlns:mx="http://www.adobe.com/2006/mxml";
>         creationComplete="complete()"
>         layout="absolute">
>
>         <mx:Script>
>                 <![CDATA[
>                         import com.google.maps.Map;
>                         import com.google.maps.MapEvent;
>
>                         private var _map:Map;
>
>                         private function complete():void
>                         {
>                                 _map = new Map();
>                                 _map.key = "MY SITE KEY";
>                                 _map.setSize(new Point(mapContainer.width, 
> mapContainer.height));
>                                 _map.addEventListener(MapEvent.MAP_READY, 
> mapReady);
>                                 mapContainer.addChild(_map);
>                         }
>
>                         private function mapReady(event:MapEvent):void
>                         {
>                                 trace('mapReady');
>                         }
>                 ]]>
>         </mx:Script>
>
>         <mx:Canvas width="100%" height="100%">
>                 <mx:UIComponent id="mapContainer" width="100%" height="100%"/>
>         </mx:Canvas>
>
> </mx:Application>
>
> On Oct 23, 8:35 pm, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
> wrote:
>
> > I am trying to integrate google maps into a large java/FDS app I am
> > working on.  To make a prototype, I have constructed the following
> > example:
>
> > APPLICATION MXML:
>
> > <?xml version="1.0" encoding="utf-8"?>
> > <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml";
> > layout="absolute">
>
> >         <mx:Script>
> >                 <![CDATA[
> >                         import mx.managers.PopUpManager;
>
> >                        private function popup():void
> >                        {
> >                               PopUpManager.createPopUp(this, MapPopup, 
> > true);
> >                        }
> >                 ]]>
> >         </mx:Script>
>
> >         <mx:Canvas width="100%" height="100%">
> >                 <mx:Button label="popup" click="popup()" />
> >         </mx:Canvas>
> > </mx:Application>
>
> > MAPPOPUP MXML
>
> > <?xml version="1.0" encoding="utf-8"?>
> > <mx:Canvas
> >         xmlns:maps="com.google.maps.*"
> >         xmlns:mx="http://www.adobe.com/2006/mxml";
> >         width="400"
> >         height="300">
>
> >         <maps:Map width="100%" height="100%" key="MY SITE KEY"/>
>
> > </mx:Canvas>
>
> > If you run this app and click the popup button, you will get the
> > following stack trace:
>
> > TypeError: Error #1009: Cannot access a property or method of a null
> > object reference.
> >         at com.google.maps::Map/drawBackground()
> >         at com.google.maps::Map/onAdded()
> >         at flash.display::DisplayObjectContainer/addChildAt()
> >         at mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::
> > $addChildAt()[E:\dev\3.1.0\frameworks\projects\framework\src\mx\core
> > \UIComponent.as:5061]
> >         at mx.core::Container/addChildAt()[E:\dev\3.1.0\frameworks\projects
> > \framework\src\mx\core\Container.as:2208]
> >         at mx.core::Container/addChild()[E:\dev\3.1.0\frameworks\projects
> > \framework\src\mx\core\Container.as:2140]
> >         at mx.core::Container/createComponentFromDescriptor()[E:\dev
> > \3.1.0\frameworks\projects\framework\src\mx\core\Container.as:3674]
> >         at mx.core::Container/createComponentsFromDescriptors()[E:\dev
> > \3.1.0\frameworks\projects\framework\src\mx\core\Container.as:3486]
> >         at mx.core::Container/createChildren()[E:\dev\3.1.0\frameworks
> > \projects\framework\src\mx\core\Container.as:2582]
> >         at 
> > mx.core::UIComponent/initialize()[E:\dev\3.1.0\frameworks\projects
> > \framework\src\mx\core\UIComponent.as:5341]
> >         at mx.core::Container/initialize()[E:\dev\3.1.0\frameworks\projects
> > \framework\src\mx\core\Container.as:2519]
> >         at 
> > MapPopup/initialize()[/Users/mreynolds/Documents/gatewayworkspace/
> > GoogleMapsTest/src/MapPopup.mxml:0]
> >         at mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/
> > internal::childAdded()[E:\dev\3.1.0\frameworks\projects\framework\src
> > \mx\managers\SystemManager.as:1639]
> >         at mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/
> > internal::rawChildren_addChildAt()[E:\dev\3.1.0\frameworks\projects
> > \framework\src\mx\managers\SystemManager.as:1689]
> >         at mx.managers::SystemManager/addChild()[E:\dev\3.1.0\frameworks
> > \projects\framework\src\mx\managers\SystemManager.as:1225]
> >         at mx.managers::PopUpManagerImpl/addPopUp()[E:\dev\3.1.0\frameworks
> > \projects\framework\src\mx\managers\PopUpManagerImpl.as:263]
> >         at 
> > mx.managers::PopUpManagerImpl/createPopUp()[E:\dev\3.1.0\frameworks
> > \projects\framework\src\mx\managers\PopUpManagerImpl.as:178]
> >         at mx.managers::PopUpManager$/createPopUp()[E:\dev\3.1.0\frameworks
> > \projects\framework\src\mx\managers\PopUpManager.as:124]
> >         at 
> > GoogleMapsTest/popup()[/Users/mreynolds/Documents/gatewayworkspace/
> > GoogleMapsTest/src/GoogleMapsTest.mxml:87]
> >         at 
> > GoogleMapsTest/___GoogleMapsTest_Button1_click()[/Users/mreynolds/
> > Documents/gatewayworkspace/GoogleMapsTest/src/GoogleMapsTest.mxml:100]
>
> > I have seen one other post on this forum that included this error and
> > no resolution was posted.  In my real app, I am simply trying to add a
> > map to a tab of a tab navigator of the main application view and I get
> > this same error.  I am not trying to call any functions or methods on
> > the map, the map has no ID, no listeners, nothing.  Still, I can't get
> > a map to even initialize, let alone do anything with it after that
> > point.  If I move the map mxml tag into the main application, instead
> > of in this popup in the example, it works fine.
>
> > Can anyone help me?  This issue seems quite easy to reproduce and I
> > feel it has been overlooked.  I would like to use google maps in my
> > flex app!!
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