Here is example Application:
<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"> <mx:Script> <![CDATA[ import mx.controls.Alert; ]]> </mx:Script> <mx:Button x="133" y="10" label="s1" id="button1" click="{mod1.url='modules/m1.swf';mod1.loadModule();}"/> <mx:Button x="181" y="10" label="s2" id="button2" click="{mod1.url='modules/m2.swf';mod1.loadModule();}"/> <mx:Canvas id="c1"> <mx:ModuleLoader id="mod1" width="100%" height="100%" x="0" y="100" loading="Alert.show('LOADING')" ready="Alert.show('READY')"/> </mx:Canvas> </mx:Application> Module1: <?xml version="1.0" encoding="utf-8"?> <mx:Module xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="400" height="300" backgroundColor="green"> <mx:VBox width="100%" height="100%"> <mx:ViewStack x="0" y="0" id="viewstack1" width="100%" height="100%"> <mx:Canvas label="View 1" width="100%" height="100%"> <mx:Label text="View 1"/> </mx:Canvas> <mx:Canvas label="View 2" width="100%" height="100%"> <mx:Label text="View 2"/> </mx:Canvas> </mx:ViewStack> <mx:ToggleButtonBar dataProvider="viewstack1"> </mx:ToggleButtonBar> </mx:VBox> </mx:Module> Module2: <?xml version="1.0" encoding="utf-8"?> <mx:Module xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="400" height="300" backgroundColor="red"> <mx:VBox width="100%" height="100%"> <mx:ViewStack x="0" y="0" id="viewstack1" width="100%" height="100%"> <mx:Canvas label="View 1" width="100%" height="100%"> <mx:Label text="View 1"/> </mx:Canvas> <mx:Canvas label="View 2" width="100%" height="100%"> <mx:Label text="View 2"/> </mx:Canvas> </mx:ViewStack> <mx:ToggleButtonBar dataProvider="viewstack1"> </mx:ToggleButtonBar> </mx:VBox> </mx:Module> Whel click button S1 - module loaded OK, When Click button S2 - gives error: TypeError: Error #1034: Type Coercion failed: cannot convert mx.controls::[EMAIL PROTECTED] to mx.controls.ButtonBar. at mx.skins.halo::ButtonBarButtonSkin/mx.skins.halo:ButtonBarButtonSkin::up\ dateDisplayList() at mx.skins::ProgrammaticSkin/validateDisplayList() at mx.managers::LayoutManager/::validateDisplayList() at mx.managers::LayoutManager/::doPhasedInstantiation() at Function/http://adobe.com/AS3/2006/builtin::apply() at mx.core::UIComponent/::callLaterDispatcher2() at mx.core::UIComponent/::callLaterDispatcher() at flash.utils::Timer/flash.utils:Timer::_timerDispatch() at flash.utils::Timer/flash.utils:Timer::tick() in Debug mode even more fancy thing going on, when click at S1 gives right away error: VerifyError: Error #1014: Class mx.collections::IList could not be found. at global$init() at ()[E:\!!Project\Flex\PicasaFlex\modules\m2.mxml:0] at Function/http://adobe.com/AS3/2006/builtin::call() at mx.core::ComponentDescriptor/get properties()[E:\dev\flex\sdk\frameworks\projects\framework\src\mx\core\C\ omponentDescriptor.as:239] at mx.core::Container/createComponentFromDescriptor()[E:\dev\flex_3_beta2\s\ dk\frameworks\projects\framework\src\mx\core\Container.as:3586] at mx.core::Container/createComponentsFromDescriptors()[E:\dev\flex_3_beta2\ \sdk\frameworks\projects\framework\src\mx\core\Container.as:3522] at mx.core::Container/mx.core:Container::createChildren()[E:\dev\flex_3_bet\ a2\sdk\frameworks\projects\framework\src\mx\core\Container.as:2624] at mx.core::UIComponent/initialize()[E:\dev\flex_3_beta2\sdk\frameworks\pro\ jects\framework\src\mx\core\UIComponent.as:5144] at mx.core::Container/initialize()[E:\dev\flex_3_beta2\sdk\frameworks\proje\ cts\framework\src\mx\core\Container.as:2561] at modules::m2/initialize()[E:\!!Project\Flex\PicasaFlex\modules\m2.mxml:0] at mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::childAd\ ded()[E:\dev\flex_3_beta2\sdk\frameworks\projects\framework\src\mx\core\\ UIComponent.as:5041] at mx.core::Container/http://www.adobe.com/2006/flex/mx/internal::childAdde\ d()[E:\dev\flex_3_beta2\sdk\frameworks\projects\framework\src\mx\core\Co\ ntainer.as:3334] at mx.core::Container/addChildAt()[E:\dev\flex_3_beta2\sdk\frameworks\proje\ cts\framework\src\mx\core\Container.as:2258] at mx.core::Container/addChild()[E:\dev\flex_3_beta2\sdk\frameworks\project\ s\framework\src\mx\core\Container.as:2188] at mx.modules::ModuleLoader/mx.modules:ModuleLoader::moduleReadyHandler()[E\ :\dev\flex_3_beta2\sdk\frameworks\projects\framework\src\mx\modules\Modu\ leLoader.as:339] at flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchEven\ tFunction() at flash.events::EventDispatcher/dispatchEvent() at ModuleManager.as$25::ModuleInfoProxy/ModuleManager.as$25:ModuleInfoProxy\ ::moduleEventHandler()[E:\dev\flex_3_beta2\sdk\frameworks\projects\frame\ work\src\mx\modules\ModuleManager.as:1025] at flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchEven\ tFunction() at flash.events::EventDispatcher/dispatchEvent() at ModuleManager.as$25::ModuleInfo/readyHandler()[E:\dev\flex_3_beta2\sdk\f\ rameworks\projects\framework\src\mx\modules\ModuleManager.as:704] at flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchEven\ tFunction() at flash.events::EventDispatcher/dispatchEvent() at mx.core::FlexModuleFactory/mx.core:FlexModuleFactory::update()[E:\dev\fl\ ex_3_beta2\sdk\frameworks\projects\framework\src\mx\core\FlexModuleFacto\ ry.as:321] at mx.core::FlexModuleFactory/mx.core:FlexModuleFactory::docFrameHandler()[\ E:\dev\flex_3_beta2\sdk\frameworks\projects\framework\src\mx\core\FlexMo\ duleFactory.as:406] Any ideas what is going on? may be I do something wrong?