Looks like the style code may not be loading correctly. What happens if you use an MXML file for your application instead of AS?
Matt ________________________________ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of bookymcnuggett Sent: Thursday, November 16, 2006 5:49 PM To: [email protected] Subject: [flexcoders] Newbie: Why can't I add a button! Hi All, This is my first posting to this forum. I have taken my first newbie steps to creating a stand-alone AS3 Application and have come across something I cannot understand. I have an Application, and add an Image to it and it is fine. I add a Button to it and it blows up with the AS3 equivalent of a null pointer exception. The code is below. The error is below that. If I comment out the line that does the "addChild(button)" it correctly adds and displays the Image. What am I doing wrong? What is wrong with how I am adding a button? Both Button and Image descend from UIComponent. package { import mx.core.*; import mx.events.*; import mx.skins.halo.*; import mx.styles.*; import mx.controls.*; import flash.display.*; public class FirstApp extends Application { [Embed(source="connected_multiple_big.jpg")] private var ImageClass:Class; public function FirstApp() { super(); this.layout = "vertical"; this.setStyle("borderSkin",mx.skins.halo.HaloBorder); this.addEventListener(FlexEvent.APPLICATION_COMPLETE, doInit); } private function doInit(e:FlexEvent):void { var img:Image = new Image(); img.setStyle("verticalAlign","top"); img.source = ImageClass; addChild(img); // the troublesome test button. addChild() here causes a null object reference exception var button:Button = new Button(); button.label = "label"; addChild(button); } } } /// **************************** TypeError: Error #1009: Cannot access a property or method of a null object reference. at mx.core::UIComponent/getStyle() at mx.controls::Button/http://www.adobe.com/2006/flex/mx/internal::viewS <http://www.adobe.com/2006/flex/mx/internal::viewS> kinForPhase() at mx.controls::Button/http://www.adobe.com/2006/flex/mx/internal::viewS <http://www.adobe.com/2006/flex/mx/internal::viewS> kin() at mx.controls::Button/mx.controls:Button::commitProperties() at mx.core::UIComponent/validateProperties() at mx.managers::LayoutManager/::validateProperties() at mx.managers::LayoutManager/::doPhasedInstantiation() at Function/http://adobe.com/AS3/2006/builtin::apply <http://adobe.com/AS3/2006/builtin::apply> () at mx.core::UIComponent/::callLaterDispatcher2() at mx.core::UIComponent/::callLaterDispatcher() at flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchE ventFunction() at flash.events::EventDispatcher/dispatchEvent() at mx.managers::SystemManager/::preloader_preloaderDoneHandler() at flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchE ventFunction() at flash.events::EventDispatcher/dispatchEvent() at mx.preloaders::Preloader/::displayClassCompleteHandler() at flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchE ventFunction() at flash.events::EventDispatcher/dispatchEvent() at mx.preloaders::DownloadProgressBar/::timerHandler() at mx.preloaders::DownloadProgressBar/::initCompleteHandler() at flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchE ventFunction() at flash.events::EventDispatcher/dispatchEvent() at mx.preloaders::Preloader/::dispatchAppEndEvent() at mx.preloaders::Preloader/::appCreationCompleteHandler() at flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchE ventFunction() at flash.events::EventDispatcher/dispatchEvent() at mx.core::UIComponent/set initialized() at mx.managers::LayoutManager/::doPhasedInstantiation() at Function/http://adobe.com/AS3/2006/builtin::apply <http://adobe.com/AS3/2006/builtin::apply> () at mx.core::UIComponent/::callLaterDispatcher2() at mx.core::UIComponent/::callLaterDispatcher()
